11da177e4SLinus Torvalds# 21da177e4SLinus Torvalds# IP configuration 31da177e4SLinus Torvalds# 41da177e4SLinus Torvaldsconfig IP_MULTICAST 51da177e4SLinus Torvalds bool "IP: multicasting" 61da177e4SLinus Torvalds help 71da177e4SLinus Torvalds This is code for addressing several networked computers at once, 81da177e4SLinus Torvalds enlarging your kernel by about 2 KB. You need multicasting if you 91da177e4SLinus Torvalds intend to participate in the MBONE, a high bandwidth network on top 101da177e4SLinus Torvalds of the Internet which carries audio and video broadcasts. More 111da177e4SLinus Torvalds information about the MBONE is on the WWW at 124960c2c6SJean Sacren <http://www.savetz.com/mbone/>. For most people, it's safe to say N. 131da177e4SLinus Torvalds 141da177e4SLinus Torvaldsconfig IP_ADVANCED_ROUTER 151da177e4SLinus Torvalds bool "IP: advanced router" 161da177e4SLinus Torvalds ---help--- 171da177e4SLinus Torvalds If you intend to run your Linux box mostly as a router, i.e. as a 181da177e4SLinus Torvalds computer that forwards and redistributes network packets, say Y; you 191da177e4SLinus Torvalds will then be presented with several options that allow more precise 201da177e4SLinus Torvalds control about the routing process. 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds The answer to this question won't directly affect the kernel: 231da177e4SLinus Torvalds answering N will just cause the configurator to skip all the 241da177e4SLinus Torvalds questions about advanced routing. 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds Note that your box can only act as a router if you enable IP 271da177e4SLinus Torvalds forwarding in your kernel; you can do that by saying Y to "/proc 281da177e4SLinus Torvalds file system support" and "Sysctl support" below and executing the 291da177e4SLinus Torvalds line 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds echo "1" > /proc/sys/net/ipv4/ip_forward 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds at boot time after the /proc file system has been mounted. 341da177e4SLinus Torvalds 35b2cc46a8SJesper Dangaard Brouer If you turn on IP forwarding, you should consider the rp_filter, which 361da177e4SLinus Torvalds automatically rejects incoming packets if the routing table entry 371da177e4SLinus Torvalds for their source address doesn't match the network interface they're 381da177e4SLinus Torvalds arriving on. This has security advantages because it prevents the 391da177e4SLinus Torvalds so-called IP spoofing, however it can pose problems if you use 401da177e4SLinus Torvalds asymmetric routing (packets from you to a host take a different path 411da177e4SLinus Torvalds than packets from that host to you) or if you operate a non-routing 421da177e4SLinus Torvalds host which has several IP addresses on different interfaces. To turn 43d7394372SDave Jones rp_filter on use: 441da177e4SLinus Torvalds 45d7394372SDave Jones echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter 46750e9fadSNicolas Dichtel or 47d7394372SDave Jones echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter 481da177e4SLinus Torvalds 49b2cc46a8SJesper Dangaard Brouer Note that some distributions enable it in startup scripts. 50d18921a0SJesper Dangaard Brouer For details about rp_filter strict and loose mode read 51d18921a0SJesper Dangaard Brouer <file:Documentation/networking/ip-sysctl.txt>. 52b2cc46a8SJesper Dangaard Brouer 531da177e4SLinus Torvalds If unsure, say N here. 541da177e4SLinus Torvalds 5566a2f7fdSStephen Hemmingerconfig IP_FIB_TRIE_STATS 5666a2f7fdSStephen Hemminger bool "FIB TRIE statistics" 573630b7c0SDavid S. Miller depends on IP_ADVANCED_ROUTER 5866a2f7fdSStephen Hemminger ---help--- 5966a2f7fdSStephen Hemminger Keep track of statistics on structure of FIB TRIE table. 6066a2f7fdSStephen Hemminger Useful for testing and measuring TRIE performance. 6166a2f7fdSStephen Hemminger 621da177e4SLinus Torvaldsconfig IP_MULTIPLE_TABLES 631da177e4SLinus Torvalds bool "IP: policy routing" 641da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 65e1ef4bf2SThomas Graf select FIB_RULES 661da177e4SLinus Torvalds ---help--- 671da177e4SLinus Torvalds Normally, a router decides what to do with a received packet based 681da177e4SLinus Torvalds solely on the packet's final destination address. If you say Y here, 691da177e4SLinus Torvalds the Linux router will also be able to take the packet's source 701da177e4SLinus Torvalds address into account. Furthermore, the TOS (Type-Of-Service) field 711da177e4SLinus Torvalds of the packet can be used for routing decisions as well. 721da177e4SLinus Torvalds 7312ed3772SStephen Hemminger If you need more information, see the Linux Advanced 7412ed3772SStephen Hemminger Routing and Traffic Control documentation at 7512ed3772SStephen Hemminger <http://lartc.org/howto/lartc.rpdb.html> 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds If unsure, say N. 781da177e4SLinus Torvalds 791da177e4SLinus Torvaldsconfig IP_ROUTE_MULTIPATH 801da177e4SLinus Torvalds bool "IP: equal cost multipath" 811da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 821da177e4SLinus Torvalds help 831da177e4SLinus Torvalds Normally, the routing tables specify a single action to be taken in 841da177e4SLinus Torvalds a deterministic manner for a given packet. If you say Y here 851da177e4SLinus Torvalds however, it becomes possible to attach several actions to a packet 861da177e4SLinus Torvalds pattern, in effect specifying several alternative paths to travel 871da177e4SLinus Torvalds for those packets. The router considers all these paths to be of 881da177e4SLinus Torvalds equal "cost" and chooses one of them in a non-deterministic fashion 891da177e4SLinus Torvalds if a matching packet arrives. 901da177e4SLinus Torvalds 911da177e4SLinus Torvaldsconfig IP_ROUTE_VERBOSE 921da177e4SLinus Torvalds bool "IP: verbose route monitoring" 931da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 941da177e4SLinus Torvalds help 951da177e4SLinus Torvalds If you say Y here, which is recommended, then the kernel will print 961da177e4SLinus Torvalds verbose messages regarding the routing, for example warnings about 971da177e4SLinus Torvalds received packets which look strange and could be evidence of an 981da177e4SLinus Torvalds attack or a misconfigured system somewhere. The information is 991da177e4SLinus Torvalds handled by the klogd daemon which is responsible for kernel messages 1001da177e4SLinus Torvalds ("man klogd"). 1011da177e4SLinus Torvalds 102c7066f70SPatrick McHardyconfig IP_ROUTE_CLASSID 103c7066f70SPatrick McHardy bool 104c7066f70SPatrick McHardy 1051da177e4SLinus Torvaldsconfig IP_PNP 1061da177e4SLinus Torvalds bool "IP: kernel level autoconfiguration" 1071da177e4SLinus Torvalds help 1081da177e4SLinus Torvalds This enables automatic configuration of IP addresses of devices and 1091da177e4SLinus Torvalds of the routing table during kernel boot, based on either information 1101da177e4SLinus Torvalds supplied on the kernel command line or by BOOTP or RARP protocols. 1111da177e4SLinus Torvalds You need to say Y only for diskless machines requiring network 1121da177e4SLinus Torvalds access to boot (in which case you want to say Y to "Root file system 1131da177e4SLinus Torvalds on NFS" as well), because all other machines configure the network 1141da177e4SLinus Torvalds in their startup scripts. 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvaldsconfig IP_PNP_DHCP 1171da177e4SLinus Torvalds bool "IP: DHCP support" 1181da177e4SLinus Torvalds depends on IP_PNP 1191da177e4SLinus Torvalds ---help--- 1201da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1211da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1221da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1231da177e4SLinus Torvalds discovered automatically at boot time using the DHCP protocol (a 1241da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1251da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1261da177e4SLinus Torvalds does DHCP itself, providing all necessary information on the kernel 1271da177e4SLinus Torvalds command line, you can say N here. 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds If unsure, say Y. Note that if you want to use DHCP, a DHCP server 1301da177e4SLinus Torvalds must be operating on your network. Read 131dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvaldsconfig IP_PNP_BOOTP 1341da177e4SLinus Torvalds bool "IP: BOOTP support" 1351da177e4SLinus Torvalds depends on IP_PNP 1361da177e4SLinus Torvalds ---help--- 1371da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1381da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1391da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1401da177e4SLinus Torvalds discovered automatically at boot time using the BOOTP protocol (a 1411da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1421da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1431da177e4SLinus Torvalds does BOOTP itself, providing all necessary information on the kernel 1441da177e4SLinus Torvalds command line, you can say N here. If unsure, say Y. Note that if you 1451da177e4SLinus Torvalds want to use BOOTP, a BOOTP server must be operating on your network. 146dc7a0816SJ. Bruce Fields Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvaldsconfig IP_PNP_RARP 1491da177e4SLinus Torvalds bool "IP: RARP support" 1501da177e4SLinus Torvalds depends on IP_PNP 1511da177e4SLinus Torvalds help 1521da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1531da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1541da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1551da177e4SLinus Torvalds discovered automatically at boot time using the RARP protocol (an 1561da177e4SLinus Torvalds older protocol which is being obsoleted by BOOTP and DHCP), say Y 1571da177e4SLinus Torvalds here. Note that if you want to use RARP, a RARP server must be 1586ded55daSJ. Bruce Fields operating on your network. Read 159dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvaldsconfig NET_IPIP 1621da177e4SLinus Torvalds tristate "IP: tunneling" 163d2acc347SHerbert Xu select INET_TUNNEL 164fd58156eSPravin B Shelar select NET_IP_TUNNEL 1651da177e4SLinus Torvalds ---help--- 1661da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 1671da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 1681da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 1691da177e4SLinus Torvalds encapsulation of IP within IP, which sounds kind of pointless, but 1701da177e4SLinus Torvalds can be useful if you want to make your (or some other) machine 1711da177e4SLinus Torvalds appear on a different network than it physically is, or to use 1721da177e4SLinus Torvalds mobile-IP facilities (allowing laptops to seamlessly move between 1731da177e4SLinus Torvalds networks without changing their IP addresses). 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds Saying Y to this option will produce two modules ( = code which can 1761da177e4SLinus Torvalds be inserted in and removed from the running kernel whenever you 1771da177e4SLinus Torvalds want). Most people won't need this and can say N. 1781da177e4SLinus Torvalds 17900959adeSDmitry Kozlovconfig NET_IPGRE_DEMUX 18000959adeSDmitry Kozlov tristate "IP: GRE demultiplexer" 18100959adeSDmitry Kozlov help 18200959adeSDmitry Kozlov This is helper module to demultiplex GRE packets on GRE version field criteria. 18300959adeSDmitry Kozlov Required by ip_gre and pptp modules. 18400959adeSDmitry Kozlov 185c5441932SPravin B Shelarconfig NET_IP_TUNNEL 186c5441932SPravin B Shelar tristate 187e09acddfSPaolo Abeni select DST_CACHE 18897e219b7SEric Dumazet select GRO_CELLS 189c5441932SPravin B Shelar default n 190c5441932SPravin B Shelar 1911da177e4SLinus Torvaldsconfig NET_IPGRE 1921da177e4SLinus Torvalds tristate "IP: GRE tunnels over IP" 19321a180cdSDavid S. Miller depends on (IPV6 || IPV6=n) && NET_IPGRE_DEMUX 194c5441932SPravin B Shelar select NET_IP_TUNNEL 1951da177e4SLinus Torvalds help 1961da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 1971da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 1981da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 1991da177e4SLinus Torvalds GRE (Generic Routing Encapsulation) and at this time allows 2001da177e4SLinus Torvalds encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. 2011da177e4SLinus Torvalds This driver is useful if the other endpoint is a Cisco router: Cisco 2021da177e4SLinus Torvalds likes GRE much better than the other Linux tunneling driver ("IP 2031da177e4SLinus Torvalds tunneling" above). In addition, GRE allows multicast redistribution 2041da177e4SLinus Torvalds through the tunnel. 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvaldsconfig NET_IPGRE_BROADCAST 2071da177e4SLinus Torvalds bool "IP: broadcast GRE over IP" 2081da177e4SLinus Torvalds depends on IP_MULTICAST && NET_IPGRE 2091da177e4SLinus Torvalds help 2101da177e4SLinus Torvalds One application of GRE/IP is to construct a broadcast WAN (Wide Area 2111da177e4SLinus Torvalds Network), which looks like a normal Ethernet LAN (Local Area 2121da177e4SLinus Torvalds Network), but can be distributed all over the Internet. If you want 2131da177e4SLinus Torvalds to do that, say Y here and to "IP multicast routing" below. 2141da177e4SLinus Torvalds 2156853f21fSYuval Mintzconfig IP_MROUTE_COMMON 2166853f21fSYuval Mintz bool 2176853f21fSYuval Mintz depends on IP_MROUTE || IPV6_MROUTE 2186853f21fSYuval Mintz 2191da177e4SLinus Torvaldsconfig IP_MROUTE 2201da177e4SLinus Torvalds bool "IP: multicast routing" 2211da177e4SLinus Torvalds depends on IP_MULTICAST 2226853f21fSYuval Mintz select IP_MROUTE_COMMON 2231da177e4SLinus Torvalds help 2241da177e4SLinus Torvalds This is used if you want your machine to act as a router for IP 2251da177e4SLinus Torvalds packets that have several destination addresses. It is needed on the 2261da177e4SLinus Torvalds MBONE, a high bandwidth network on top of the Internet which carries 2271da177e4SLinus Torvalds audio and video broadcasts. In order to do that, you would most 2284960c2c6SJean Sacren likely run the program mrouted. If you haven't heard about it, you 2294960c2c6SJean Sacren don't need it. 2301da177e4SLinus Torvalds 231f0ad0860SPatrick McHardyconfig IP_MROUTE_MULTIPLE_TABLES 232f0ad0860SPatrick McHardy bool "IP: multicast policy routing" 23366496d49SPatrick McHardy depends on IP_MROUTE && IP_ADVANCED_ROUTER 234f0ad0860SPatrick McHardy select FIB_RULES 235f0ad0860SPatrick McHardy help 236f0ad0860SPatrick McHardy Normally, a multicast router runs a userspace daemon and decides 237f0ad0860SPatrick McHardy what to do with a multicast packet based on the source and 238f0ad0860SPatrick McHardy destination addresses. If you say Y here, the multicast router 239f0ad0860SPatrick McHardy will also be able to take interfaces and packet marks into 240f0ad0860SPatrick McHardy account and run multiple instances of userspace daemons 241f0ad0860SPatrick McHardy simultaneously, each one handling a single table. 242f0ad0860SPatrick McHardy 243f0ad0860SPatrick McHardy If unsure, say N. 244f0ad0860SPatrick McHardy 2451da177e4SLinus Torvaldsconfig IP_PIMSM_V1 2461da177e4SLinus Torvalds bool "IP: PIM-SM version 1 support" 2471da177e4SLinus Torvalds depends on IP_MROUTE 2481da177e4SLinus Torvalds help 2491da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM (Protocol Independent 2501da177e4SLinus Torvalds Multicast) version 1. This multicast routing protocol is used widely 2511da177e4SLinus Torvalds because Cisco supports it. You need special software to use it 2521da177e4SLinus Torvalds (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more 2531da177e4SLinus Torvalds information about PIM. 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds Say Y if you want to use PIM-SM v1. Note that you can say N here if 2561da177e4SLinus Torvalds you just want to use Dense Mode PIM. 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvaldsconfig IP_PIMSM_V2 2591da177e4SLinus Torvalds bool "IP: PIM-SM version 2 support" 2601da177e4SLinus Torvalds depends on IP_MROUTE 2611da177e4SLinus Torvalds help 2621da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM version 2. In order to use 2631da177e4SLinus Torvalds this, you need an experimental routing daemon supporting it (pimd or 2641da177e4SLinus Torvalds gated-5). This routing protocol is not used widely, so say N unless 2651da177e4SLinus Torvalds you want to play with it. 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvaldsconfig SYN_COOKIES 26857f1553eSFlorian Westphal bool "IP: TCP syncookie support" 2691da177e4SLinus Torvalds ---help--- 2701da177e4SLinus Torvalds Normal TCP/IP networking is open to an attack known as "SYN 2711da177e4SLinus Torvalds flooding". This denial-of-service attack prevents legitimate remote 2721da177e4SLinus Torvalds users from being able to connect to your computer during an ongoing 2731da177e4SLinus Torvalds attack and requires very little work from the attacker, who can 2741da177e4SLinus Torvalds operate from anywhere on the Internet. 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds SYN cookies provide protection against this type of attack. If you 2771da177e4SLinus Torvalds say Y here, the TCP/IP stack will use a cryptographic challenge 2781da177e4SLinus Torvalds protocol known as "SYN cookies" to enable legitimate users to 2791da177e4SLinus Torvalds continue to connect, even when your machine is under attack. There 2801da177e4SLinus Torvalds is no need for the legitimate users to change their TCP/IP software; 2811da177e4SLinus Torvalds SYN cookies work transparently to them. For technical information 2821da177e4SLinus Torvalds about SYN cookies, check out <http://cr.yp.to/syncookies.html>. 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds If you are SYN flooded, the source address reported by the kernel is 2851da177e4SLinus Torvalds likely to have been forged by the attacker; it is only reported as 2861da177e4SLinus Torvalds an aid in tracing the packets to their actual source and should not 2871da177e4SLinus Torvalds be taken as absolute truth. 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds SYN cookies may prevent correct error reporting on clients when the 2901da177e4SLinus Torvalds server is really overloaded. If this happens frequently better turn 2911da177e4SLinus Torvalds them off. 2921da177e4SLinus Torvalds 29357f1553eSFlorian Westphal If you say Y here, you can disable SYN cookies at run time by 29457f1553eSFlorian Westphal saying Y to "/proc file system support" and 2951da177e4SLinus Torvalds "Sysctl support" below and executing the command 2961da177e4SLinus Torvalds 29757f1553eSFlorian Westphal echo 0 > /proc/sys/net/ipv4/tcp_syncookies 2981da177e4SLinus Torvalds 29957f1553eSFlorian Westphal after the /proc file system has been mounted. 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds If unsure, say N. 3021da177e4SLinus Torvalds 3031181412cSSaurabhconfig NET_IPVTI 3041181412cSSaurabh tristate "Virtual (secure) IP: tunneling" 3051181412cSSaurabh select INET_TUNNEL 306f61dd388SPravin B Shelar select NET_IP_TUNNEL 3074c145dceSFlorian Westphal select XFRM 3081181412cSSaurabh ---help--- 3091181412cSSaurabh Tunneling means encapsulating data of one protocol type within 3101181412cSSaurabh another protocol and sending it over a channel that understands the 3111181412cSSaurabh encapsulating protocol. This can be used with xfrm mode tunnel to give 3121181412cSSaurabh the notion of a secure tunnel for IPSEC and then use routing protocol 3131181412cSSaurabh on top. 3141181412cSSaurabh 3158024e028STom Herbertconfig NET_UDP_TUNNEL 3168024e028STom Herbert tristate 3177c5df8faSAndy Zhou select NET_IP_TUNNEL 3188024e028STom Herbert default n 3198024e028STom Herbert 32023461551STom Herbertconfig NET_FOU 32123461551STom Herbert tristate "IP: Foo (IP protocols) over UDP" 32223461551STom Herbert select XFRM 32323461551STom Herbert select NET_UDP_TUNNEL 32423461551STom Herbert ---help--- 32523461551STom Herbert Foo over UDP allows any IP protocol to be directly encapsulated 32623461551STom Herbert over UDP include tunnels (IPIP, GRE, SIT). By encapsulating in UDP 32723461551STom Herbert network mechanisms and optimizations for UDP (such as ECMP 32823461551STom Herbert and RSS) can be leveraged to provide better service. 32923461551STom Herbert 33063487babSTom Herbertconfig NET_FOU_IP_TUNNELS 33163487babSTom Herbert bool "IP: FOU encapsulation of IP tunnels" 33263487babSTom Herbert depends on NET_IPIP || NET_IPGRE || IPV6_SIT 33363487babSTom Herbert select NET_FOU 33463487babSTom Herbert ---help--- 33563487babSTom Herbert Allow configuration of FOU or GUE encapsulation for IP tunnels. 33663487babSTom Herbert When this option is enabled IP tunnels can be configured to use 33763487babSTom Herbert FOU or GUE encapsulation. 33863487babSTom Herbert 3391da177e4SLinus Torvaldsconfig INET_AH 3401da177e4SLinus Torvalds tristate "IP: AH transformation" 3417e152524SJan Beulich select XFRM_ALGO 3421da177e4SLinus Torvalds select CRYPTO 3431da177e4SLinus Torvalds select CRYPTO_HMAC 3441da177e4SLinus Torvalds select CRYPTO_MD5 3451da177e4SLinus Torvalds select CRYPTO_SHA1 3461da177e4SLinus Torvalds ---help--- 3471da177e4SLinus Torvalds Support for IPsec AH. 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds If unsure, say Y. 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvaldsconfig INET_ESP 3521da177e4SLinus Torvalds tristate "IP: ESP transformation" 3537e152524SJan Beulich select XFRM_ALGO 3541da177e4SLinus Torvalds select CRYPTO 355ed58dd41SHerbert Xu select CRYPTO_AUTHENC 3561da177e4SLinus Torvalds select CRYPTO_HMAC 3571da177e4SLinus Torvalds select CRYPTO_MD5 3586b7326c8SHerbert Xu select CRYPTO_CBC 3591da177e4SLinus Torvalds select CRYPTO_SHA1 3601da177e4SLinus Torvalds select CRYPTO_DES 36132b6170cSThomas Egerer select CRYPTO_ECHAINIV 3621da177e4SLinus Torvalds ---help--- 3631da177e4SLinus Torvalds Support for IPsec ESP. 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds If unsure, say Y. 3661da177e4SLinus Torvalds 3677785bba2SSteffen Klassertconfig INET_ESP_OFFLOAD 3687785bba2SSteffen Klassert tristate "IP: ESP transformation offload" 3697785bba2SSteffen Klassert depends on INET_ESP 3707785bba2SSteffen Klassert select XFRM_OFFLOAD 3717785bba2SSteffen Klassert default n 3727785bba2SSteffen Klassert ---help--- 3737785bba2SSteffen Klassert Support for ESP transformation offload. This makes sense 3747785bba2SSteffen Klassert only if this system really does IPsec and want to do it 3757785bba2SSteffen Klassert with high throughput. A typical desktop system does not 3767785bba2SSteffen Klassert need it, even if it does IPsec. 3777785bba2SSteffen Klassert 3787785bba2SSteffen Klassert If unsure, say N. 3797785bba2SSteffen Klassert 3801da177e4SLinus Torvaldsconfig INET_IPCOMP 3811da177e4SLinus Torvalds tristate "IP: IPComp transformation" 382d2acc347SHerbert Xu select INET_XFRM_TUNNEL 3836fccab67SHerbert Xu select XFRM_IPCOMP 3841da177e4SLinus Torvalds ---help--- 3851da177e4SLinus Torvalds Support for IP Payload Compression Protocol (IPComp) (RFC3173), 3861da177e4SLinus Torvalds typically needed for IPsec. 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds If unsure, say Y. 3891da177e4SLinus Torvalds 390d2acc347SHerbert Xuconfig INET_XFRM_TUNNEL 391d2acc347SHerbert Xu tristate 392d2acc347SHerbert Xu select INET_TUNNEL 393d2acc347SHerbert Xu default n 3941da177e4SLinus Torvalds 395d2acc347SHerbert Xuconfig INET_TUNNEL 396d2acc347SHerbert Xu tristate 397d2acc347SHerbert Xu default n 3981da177e4SLinus Torvalds 39917b085eaSArnaldo Carvalho de Meloconfig INET_DIAG 40017b085eaSArnaldo Carvalho de Melo tristate "INET: socket monitoring interface" 4011da177e4SLinus Torvalds default y 4021da177e4SLinus Torvalds ---help--- 40373c1f4a0SArnaldo Carvalho de Melo Support for INET (TCP, DCCP, etc) socket monitoring interface used by 40473c1f4a0SArnaldo Carvalho de Melo native Linux tools such as ss. ss is included in iproute2, currently 405c996d8b9SMichael Witten downloadable at: 406c996d8b9SMichael Witten 407c996d8b9SMichael Witten http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds If unsure, say Y. 4101da177e4SLinus Torvalds 41117b085eaSArnaldo Carvalho de Meloconfig INET_TCP_DIAG 41217b085eaSArnaldo Carvalho de Melo depends on INET_DIAG 41317b085eaSArnaldo Carvalho de Melo def_tristate INET_DIAG 41417b085eaSArnaldo Carvalho de Melo 415507dd796SPavel Emelyanovconfig INET_UDP_DIAG 4166d62a66eSDavid S. Miller tristate "UDP: socket monitoring interface" 4176d25886eSAnisse Astier depends on INET_DIAG && (IPV6 || IPV6=n) 4186d62a66eSDavid S. Miller default n 4196d62a66eSDavid S. Miller ---help--- 4206d62a66eSDavid S. Miller Support for UDP socket monitoring interface used by the ss tool. 4216d62a66eSDavid S. Miller If unsure, say Y. 422507dd796SPavel Emelyanov 423432490f9SCyrill Gorcunovconfig INET_RAW_DIAG 424432490f9SCyrill Gorcunov tristate "RAW: socket monitoring interface" 425432490f9SCyrill Gorcunov depends on INET_DIAG && (IPV6 || IPV6=n) 426432490f9SCyrill Gorcunov default n 427432490f9SCyrill Gorcunov ---help--- 428432490f9SCyrill Gorcunov Support for RAW socket monitoring interface used by the ss tool. 429432490f9SCyrill Gorcunov If unsure, say Y. 430432490f9SCyrill Gorcunov 431c1e64e29SLorenzo Colitticonfig INET_DIAG_DESTROY 432c1e64e29SLorenzo Colitti bool "INET: allow privileged process to administratively close sockets" 433c1e64e29SLorenzo Colitti depends on INET_DIAG 434c1e64e29SLorenzo Colitti default n 435c1e64e29SLorenzo Colitti ---help--- 436c1e64e29SLorenzo Colitti Provides a SOCK_DESTROY operation that allows privileged processes 437c1e64e29SLorenzo Colitti (e.g., a connection manager or a network administration tool such as 438c1e64e29SLorenzo Colitti ss) to close sockets opened by other processes. Closing a socket in 439c1e64e29SLorenzo Colitti this way interrupts any blocking read/write/connect operations on 440c1e64e29SLorenzo Colitti the socket and causes future socket calls to behave as if the socket 441c1e64e29SLorenzo Colitti had been disconnected. 442c1e64e29SLorenzo Colitti If unsure, say N. 443c1e64e29SLorenzo Colitti 4443d2573f7SStephen Hemmingermenuconfig TCP_CONG_ADVANCED 445a6484045SDavid S. Miller bool "TCP: advanced congestion control" 446a6484045SDavid S. Miller ---help--- 447a6484045SDavid S. Miller Support for selection of various TCP congestion control 448a6484045SDavid S. Miller modules. 449a6484045SDavid S. Miller 450a6484045SDavid S. Miller Nearly all users can safely say no here, and a safe default 451597811ecSStephen Hemminger selection will be made (CUBIC with new Reno as a fallback). 452a6484045SDavid S. Miller 453a6484045SDavid S. Miller If unsure, say N. 454a6484045SDavid S. Miller 4553d2573f7SStephen Hemmingerif TCP_CONG_ADVANCED 45683803034SStephen Hemminger 45783803034SStephen Hemmingerconfig TCP_CONG_BIC 45883803034SStephen Hemminger tristate "Binary Increase Congestion (BIC) control" 459597811ecSStephen Hemminger default m 46083803034SStephen Hemminger ---help--- 46183803034SStephen Hemminger BIC-TCP is a sender-side only change that ensures a linear RTT 46283803034SStephen Hemminger fairness under large windows while offering both scalability and 46383803034SStephen Hemminger bounded TCP-friendliness. The protocol combines two schemes 46483803034SStephen Hemminger called additive increase and binary search increase. When the 46583803034SStephen Hemminger congestion window is large, additive increase with a large 46683803034SStephen Hemminger increment ensures linear RTT fairness as well as good 46783803034SStephen Hemminger scalability. Under small congestion windows, binary search 46883803034SStephen Hemminger increase provides TCP friendliness. 46983803034SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/ 47083803034SStephen Hemminger 471df3271f3SStephen Hemmingerconfig TCP_CONG_CUBIC 472df3271f3SStephen Hemminger tristate "CUBIC TCP" 473597811ecSStephen Hemminger default y 474df3271f3SStephen Hemminger ---help--- 475df3271f3SStephen Hemminger This is version 2.0 of BIC-TCP which uses a cubic growth function 476df3271f3SStephen Hemminger among other techniques. 477df3271f3SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf 478df3271f3SStephen Hemminger 47987270762SStephen Hemmingerconfig TCP_CONG_WESTWOOD 48087270762SStephen Hemminger tristate "TCP Westwood+" 48187270762SStephen Hemminger default m 48287270762SStephen Hemminger ---help--- 48387270762SStephen Hemminger TCP Westwood+ is a sender-side only modification of the TCP Reno 48487270762SStephen Hemminger protocol stack that optimizes the performance of TCP congestion 48587270762SStephen Hemminger control. It is based on end-to-end bandwidth estimation to set 48687270762SStephen Hemminger congestion window and slow start threshold after a congestion 48787270762SStephen Hemminger episode. Using this estimation, TCP Westwood+ adaptively sets a 48887270762SStephen Hemminger slow start threshold and a congestion window which takes into 48987270762SStephen Hemminger account the bandwidth used at the time congestion is experienced. 49087270762SStephen Hemminger TCP Westwood+ significantly increases fairness wrt TCP Reno in 49187270762SStephen Hemminger wired networks and throughput over wireless links. 49287270762SStephen Hemminger 493a7868ea6SBaruch Evenconfig TCP_CONG_HTCP 494a7868ea6SBaruch Even tristate "H-TCP" 495a7868ea6SBaruch Even default m 496a7868ea6SBaruch Even ---help--- 497a7868ea6SBaruch Even H-TCP is a send-side only modifications of the TCP Reno 498a7868ea6SBaruch Even protocol stack that optimizes the performance of TCP 499a7868ea6SBaruch Even congestion control for high speed network links. It uses a 500a7868ea6SBaruch Even modeswitch to change the alpha and beta parameters of TCP Reno 501a7868ea6SBaruch Even based on network conditions and in a way so as to be fair with 502a7868ea6SBaruch Even other Reno and H-TCP flows. 503a7868ea6SBaruch Even 504a628d29bSJohn Heffnerconfig TCP_CONG_HSTCP 505a628d29bSJohn Heffner tristate "High Speed TCP" 506a628d29bSJohn Heffner default n 507a628d29bSJohn Heffner ---help--- 508a628d29bSJohn Heffner Sally Floyd's High Speed TCP (RFC 3649) congestion control. 509a628d29bSJohn Heffner A modification to TCP's congestion control mechanism for use 510a628d29bSJohn Heffner with large congestion windows. A table indicates how much to 511a628d29bSJohn Heffner increase the congestion window by when an ACK is received. 512a628d29bSJohn Heffner For more detail see http://www.icir.org/floyd/hstcp.html 513a628d29bSJohn Heffner 514835b3f0cSDaniele Lacameraconfig TCP_CONG_HYBLA 515835b3f0cSDaniele Lacamera tristate "TCP-Hybla congestion control algorithm" 516835b3f0cSDaniele Lacamera default n 517835b3f0cSDaniele Lacamera ---help--- 518835b3f0cSDaniele Lacamera TCP-Hybla is a sender-side only change that eliminates penalization of 519835b3f0cSDaniele Lacamera long-RTT, large-bandwidth connections, like when satellite legs are 52044c09201SMatt LaPlante involved, especially when sharing a common bottleneck with normal 521835b3f0cSDaniele Lacamera terrestrial connections. 522835b3f0cSDaniele Lacamera 523b87d8561SStephen Hemmingerconfig TCP_CONG_VEGAS 524b87d8561SStephen Hemminger tristate "TCP Vegas" 525b87d8561SStephen Hemminger default n 526b87d8561SStephen Hemminger ---help--- 527b87d8561SStephen Hemminger TCP Vegas is a sender-side only change to TCP that anticipates 528b87d8561SStephen Hemminger the onset of congestion by estimating the bandwidth. TCP Vegas 529b87d8561SStephen Hemminger adjusts the sending rate by modifying the congestion 530b87d8561SStephen Hemminger window. TCP Vegas should provide less packet loss, but it is 531b87d8561SStephen Hemminger not as aggressive as TCP Reno. 532b87d8561SStephen Hemminger 533699fafafSLawrence Brakmoconfig TCP_CONG_NV 534699fafafSLawrence Brakmo tristate "TCP NV" 535699fafafSLawrence Brakmo default n 536699fafafSLawrence Brakmo ---help--- 537699fafafSLawrence Brakmo TCP NV is a follow up to TCP Vegas. It has been modified to deal with 538699fafafSLawrence Brakmo 10G networks, measurement noise introduced by LRO, GRO and interrupt 539699fafafSLawrence Brakmo coalescence. In addition, it will decrease its cwnd multiplicatively 540699fafafSLawrence Brakmo instead of linearly. 541699fafafSLawrence Brakmo 542699fafafSLawrence Brakmo Note that in general congestion avoidance (cwnd decreased when # packets 543699fafafSLawrence Brakmo queued grows) cannot coexist with congestion control (cwnd decreased only 544699fafafSLawrence Brakmo when there is packet loss) due to fairness issues. One scenario when they 545699fafafSLawrence Brakmo can coexist safely is when the CA flows have RTTs << CC flows RTTs. 546699fafafSLawrence Brakmo 547699fafafSLawrence Brakmo For further details see http://www.brakmo.org/networking/tcp-nv/ 548699fafafSLawrence Brakmo 5490e57976bSJohn Heffnerconfig TCP_CONG_SCALABLE 5500e57976bSJohn Heffner tristate "Scalable TCP" 5510e57976bSJohn Heffner default n 5520e57976bSJohn Heffner ---help--- 5530e57976bSJohn Heffner Scalable TCP is a sender-side only change to TCP which uses a 5540e57976bSJohn Heffner MIMD congestion control algorithm which has some nice scaling 5550e57976bSJohn Heffner properties, though is known to have fairness issues. 556f4b9479dSBaruch Even See http://www.deneholme.net/tom/scalable/ 557a7868ea6SBaruch Even 5587c106d7eSWong Hoi Sing Edisonconfig TCP_CONG_LP 5597c106d7eSWong Hoi Sing Edison tristate "TCP Low Priority" 5607c106d7eSWong Hoi Sing Edison default n 5617c106d7eSWong Hoi Sing Edison ---help--- 5627c106d7eSWong Hoi Sing Edison TCP Low Priority (TCP-LP), a distributed algorithm whose goal is 563cab00891SMatt LaPlante to utilize only the excess network bandwidth as compared to the 5647c106d7eSWong Hoi Sing Edison ``fair share`` of bandwidth as targeted by TCP. 5657c106d7eSWong Hoi Sing Edison See http://www-ece.rice.edu/networks/TCP-LP/ 5667c106d7eSWong Hoi Sing Edison 56776f10177SBin Zhouconfig TCP_CONG_VENO 56876f10177SBin Zhou tristate "TCP Veno" 56976f10177SBin Zhou default n 57076f10177SBin Zhou ---help--- 57176f10177SBin Zhou TCP Veno is a sender-side only enhancement of TCP to obtain better 57276f10177SBin Zhou throughput over wireless networks. TCP Veno makes use of state 57376f10177SBin Zhou distinguishing to circumvent the difficult judgment of the packet loss 57476f10177SBin Zhou type. TCP Veno cuts down less congestion window in response to random 57576f10177SBin Zhou loss packets. 576631dd1a8SJustin P. Mattock See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186> 57776f10177SBin Zhou 5785ef81475SAngelo P. Castellaniconfig TCP_CONG_YEAH 5795ef81475SAngelo P. Castellani tristate "YeAH TCP" 5802ff011efSDavid S. Miller select TCP_CONG_VEGAS 5815ef81475SAngelo P. Castellani default n 5825ef81475SAngelo P. Castellani ---help--- 5835ef81475SAngelo P. Castellani YeAH-TCP is a sender-side high-speed enabled TCP congestion control 5845ef81475SAngelo P. Castellani algorithm, which uses a mixed loss/delay approach to compute the 5855ef81475SAngelo P. Castellani congestion window. It's design goals target high efficiency, 5865ef81475SAngelo P. Castellani internal, RTT and Reno fairness, resilience to link loss while 5875ef81475SAngelo P. Castellani keeping network elements load as low as possible. 5885ef81475SAngelo P. Castellani 5895ef81475SAngelo P. Castellani For further details look here: 5905ef81475SAngelo P. Castellani http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf 5915ef81475SAngelo P. Castellani 592c462238dSStephen Hemmingerconfig TCP_CONG_ILLINOIS 593c462238dSStephen Hemminger tristate "TCP Illinois" 594c462238dSStephen Hemminger default n 595c462238dSStephen Hemminger ---help--- 59601dd2fbfSMatt LaPlante TCP-Illinois is a sender-side modification of TCP Reno for 597c462238dSStephen Hemminger high speed long delay links. It uses round-trip-time to 598c462238dSStephen Hemminger adjust the alpha and beta parameters to achieve a higher average 599c462238dSStephen Hemminger throughput and maintain fairness. 600c462238dSStephen Hemminger 601c462238dSStephen Hemminger For further details see: 602c462238dSStephen Hemminger http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html 603c462238dSStephen Hemminger 604e3118e83SDaniel Borkmannconfig TCP_CONG_DCTCP 605e3118e83SDaniel Borkmann tristate "DataCenter TCP (DCTCP)" 606e3118e83SDaniel Borkmann default n 607e3118e83SDaniel Borkmann ---help--- 608e3118e83SDaniel Borkmann DCTCP leverages Explicit Congestion Notification (ECN) in the network to 609e3118e83SDaniel Borkmann provide multi-bit feedback to the end hosts. It is designed to provide: 610e3118e83SDaniel Borkmann 611e3118e83SDaniel Borkmann - High burst tolerance (incast due to partition/aggregate), 612e3118e83SDaniel Borkmann - Low latency (short flows, queries), 613e3118e83SDaniel Borkmann - High throughput (continuous data updates, large file transfers) with 614e3118e83SDaniel Borkmann commodity, shallow-buffered switches. 615e3118e83SDaniel Borkmann 616e3118e83SDaniel Borkmann All switches in the data center network running DCTCP must support 617e3118e83SDaniel Borkmann ECN marking and be configured for marking when reaching defined switch 618e3118e83SDaniel Borkmann buffer thresholds. The default ECN marking threshold heuristic for 619e3118e83SDaniel Borkmann DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets 620e3118e83SDaniel Borkmann (~100KB) at 10Gbps, but might need further careful tweaking. 621e3118e83SDaniel Borkmann 622e3118e83SDaniel Borkmann For further details see: 623e3118e83SDaniel Borkmann http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf 624e3118e83SDaniel Borkmann 6252b0a8c9eSKenneth Klette Jonassenconfig TCP_CONG_CDG 6262b0a8c9eSKenneth Klette Jonassen tristate "CAIA Delay-Gradient (CDG)" 6272b0a8c9eSKenneth Klette Jonassen default n 6282b0a8c9eSKenneth Klette Jonassen ---help--- 6292b0a8c9eSKenneth Klette Jonassen CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies 6302b0a8c9eSKenneth Klette Jonassen the TCP sender in order to: 6312b0a8c9eSKenneth Klette Jonassen 6322b0a8c9eSKenneth Klette Jonassen o Use the delay gradient as a congestion signal. 6332b0a8c9eSKenneth Klette Jonassen o Back off with an average probability that is independent of the RTT. 6342b0a8c9eSKenneth Klette Jonassen o Coexist with flows that use loss-based congestion control. 6352b0a8c9eSKenneth Klette Jonassen o Tolerate packet loss unrelated to congestion. 6362b0a8c9eSKenneth Klette Jonassen 6372b0a8c9eSKenneth Klette Jonassen For further details see: 6382b0a8c9eSKenneth Klette Jonassen D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using 6392b0a8c9eSKenneth Klette Jonassen delay gradients." In Networking 2011. Preprint: http://goo.gl/No3vdg 6402b0a8c9eSKenneth Klette Jonassen 6410f8782eaSNeal Cardwellconfig TCP_CONG_BBR 6420f8782eaSNeal Cardwell tristate "BBR TCP" 6430f8782eaSNeal Cardwell default n 6440f8782eaSNeal Cardwell ---help--- 6450f8782eaSNeal Cardwell 6460f8782eaSNeal Cardwell BBR (Bottleneck Bandwidth and RTT) TCP congestion control aims to 6470f8782eaSNeal Cardwell maximize network utilization and minimize queues. It builds an explicit 6480f8782eaSNeal Cardwell model of the the bottleneck delivery rate and path round-trip 6490f8782eaSNeal Cardwell propagation delay. It tolerates packet loss and delay unrelated to 6500f8782eaSNeal Cardwell congestion. It can operate over LAN, WAN, cellular, wifi, or cable 6510f8782eaSNeal Cardwell modem links. It can coexist with flows that use loss-based congestion 6520f8782eaSNeal Cardwell control, and can operate with shallow buffers, deep buffers, 6530f8782eaSNeal Cardwell bufferbloat, policers, or AQM schemes that do not provide a delay 6540f8782eaSNeal Cardwell signal. It requires the fq ("Fair Queue") pacing packet scheduler. 6550f8782eaSNeal Cardwell 6563d2573f7SStephen Hemmingerchoice 6573d2573f7SStephen Hemminger prompt "Default TCP congestion control" 658597811ecSStephen Hemminger default DEFAULT_CUBIC 6593d2573f7SStephen Hemminger help 6603d2573f7SStephen Hemminger Select the TCP congestion control that will be used by default 6613d2573f7SStephen Hemminger for all connections. 6623d2573f7SStephen Hemminger 6633d2573f7SStephen Hemminger config DEFAULT_BIC 6643d2573f7SStephen Hemminger bool "Bic" if TCP_CONG_BIC=y 6653d2573f7SStephen Hemminger 6663d2573f7SStephen Hemminger config DEFAULT_CUBIC 6673d2573f7SStephen Hemminger bool "Cubic" if TCP_CONG_CUBIC=y 6683d2573f7SStephen Hemminger 6693d2573f7SStephen Hemminger config DEFAULT_HTCP 6703d2573f7SStephen Hemminger bool "Htcp" if TCP_CONG_HTCP=y 6713d2573f7SStephen Hemminger 672dd2acaa7SJan Engelhardt config DEFAULT_HYBLA 673dd2acaa7SJan Engelhardt bool "Hybla" if TCP_CONG_HYBLA=y 674dd2acaa7SJan Engelhardt 6753d2573f7SStephen Hemminger config DEFAULT_VEGAS 6763d2573f7SStephen Hemminger bool "Vegas" if TCP_CONG_VEGAS=y 6773d2573f7SStephen Hemminger 6786ce1a6dfSJan Engelhardt config DEFAULT_VENO 6796ce1a6dfSJan Engelhardt bool "Veno" if TCP_CONG_VENO=y 6806ce1a6dfSJan Engelhardt 6813d2573f7SStephen Hemminger config DEFAULT_WESTWOOD 6823d2573f7SStephen Hemminger bool "Westwood" if TCP_CONG_WESTWOOD=y 6833d2573f7SStephen Hemminger 684e3118e83SDaniel Borkmann config DEFAULT_DCTCP 685e3118e83SDaniel Borkmann bool "DCTCP" if TCP_CONG_DCTCP=y 686e3118e83SDaniel Borkmann 6872b0a8c9eSKenneth Klette Jonassen config DEFAULT_CDG 6882b0a8c9eSKenneth Klette Jonassen bool "CDG" if TCP_CONG_CDG=y 6892b0a8c9eSKenneth Klette Jonassen 6900f8782eaSNeal Cardwell config DEFAULT_BBR 6910f8782eaSNeal Cardwell bool "BBR" if TCP_CONG_BBR=y 6920f8782eaSNeal Cardwell 6933d2573f7SStephen Hemminger config DEFAULT_RENO 6943d2573f7SStephen Hemminger bool "Reno" 6953d2573f7SStephen Hemmingerendchoice 6963d2573f7SStephen Hemminger 6973d2573f7SStephen Hemmingerendif 69883803034SStephen Hemminger 699597811ecSStephen Hemmingerconfig TCP_CONG_CUBIC 7006c360767SDavid S. Miller tristate 701a6484045SDavid S. Miller depends on !TCP_CONG_ADVANCED 702a6484045SDavid S. Miller default y 703a6484045SDavid S. Miller 7043d2573f7SStephen Hemmingerconfig DEFAULT_TCP_CONG 7053d2573f7SStephen Hemminger string 7063d2573f7SStephen Hemminger default "bic" if DEFAULT_BIC 7073d2573f7SStephen Hemminger default "cubic" if DEFAULT_CUBIC 7083d2573f7SStephen Hemminger default "htcp" if DEFAULT_HTCP 709dd2acaa7SJan Engelhardt default "hybla" if DEFAULT_HYBLA 7103d2573f7SStephen Hemminger default "vegas" if DEFAULT_VEGAS 7113d2573f7SStephen Hemminger default "westwood" if DEFAULT_WESTWOOD 7126ce1a6dfSJan Engelhardt default "veno" if DEFAULT_VENO 7133d2573f7SStephen Hemminger default "reno" if DEFAULT_RENO 714e3118e83SDaniel Borkmann default "dctcp" if DEFAULT_DCTCP 7152b0a8c9eSKenneth Klette Jonassen default "cdg" if DEFAULT_CDG 7164df21dfcSJulian Wollrath default "bbr" if DEFAULT_BBR 717597811ecSStephen Hemminger default "cubic" 7183d2573f7SStephen Hemminger 719cfb6eeb4SYOSHIFUJI Hideakiconfig TCP_MD5SIG 72044fbe920SKees Cook bool "TCP: MD5 Signature Option support (RFC2385)" 721cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO 722cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO_MD5 723cfb6eeb4SYOSHIFUJI Hideaki ---help--- 7243dde6ad8SDavid Sterba RFC2385 specifies a method of giving MD5 protection to TCP sessions. 725cfb6eeb4SYOSHIFUJI Hideaki Its main (only?) use is to protect BGP sessions between core routers 726cfb6eeb4SYOSHIFUJI Hideaki on the Internet. 727cfb6eeb4SYOSHIFUJI Hideaki 728cfb6eeb4SYOSHIFUJI Hideaki If unsure, say N. 729