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 731da177e4SLinus Torvalds If you are interested in this, please see the preliminary 741da177e4SLinus Torvalds documentation at <http://www.compendium.com.ar/policy-routing.txt> 751da177e4SLinus Torvalds and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>. 761da177e4SLinus Torvalds You will need supporting software from 771da177e4SLinus Torvalds <ftp://ftp.tux.org/pub/net/ip-routing/>. 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds If unsure, say N. 801da177e4SLinus Torvalds 811da177e4SLinus Torvaldsconfig IP_ROUTE_MULTIPATH 821da177e4SLinus Torvalds bool "IP: equal cost multipath" 831da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 841da177e4SLinus Torvalds help 851da177e4SLinus Torvalds Normally, the routing tables specify a single action to be taken in 861da177e4SLinus Torvalds a deterministic manner for a given packet. If you say Y here 871da177e4SLinus Torvalds however, it becomes possible to attach several actions to a packet 881da177e4SLinus Torvalds pattern, in effect specifying several alternative paths to travel 891da177e4SLinus Torvalds for those packets. The router considers all these paths to be of 901da177e4SLinus Torvalds equal "cost" and chooses one of them in a non-deterministic fashion 911da177e4SLinus Torvalds if a matching packet arrives. 921da177e4SLinus Torvalds 931da177e4SLinus Torvaldsconfig IP_ROUTE_VERBOSE 941da177e4SLinus Torvalds bool "IP: verbose route monitoring" 951da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 961da177e4SLinus Torvalds help 971da177e4SLinus Torvalds If you say Y here, which is recommended, then the kernel will print 981da177e4SLinus Torvalds verbose messages regarding the routing, for example warnings about 991da177e4SLinus Torvalds received packets which look strange and could be evidence of an 1001da177e4SLinus Torvalds attack or a misconfigured system somewhere. The information is 1011da177e4SLinus Torvalds handled by the klogd daemon which is responsible for kernel messages 1021da177e4SLinus Torvalds ("man klogd"). 1031da177e4SLinus Torvalds 104c7066f70SPatrick McHardyconfig IP_ROUTE_CLASSID 105c7066f70SPatrick McHardy bool 106c7066f70SPatrick McHardy 1071da177e4SLinus Torvaldsconfig IP_PNP 1081da177e4SLinus Torvalds bool "IP: kernel level autoconfiguration" 1091da177e4SLinus Torvalds help 1101da177e4SLinus Torvalds This enables automatic configuration of IP addresses of devices and 1111da177e4SLinus Torvalds of the routing table during kernel boot, based on either information 1121da177e4SLinus Torvalds supplied on the kernel command line or by BOOTP or RARP protocols. 1131da177e4SLinus Torvalds You need to say Y only for diskless machines requiring network 1141da177e4SLinus Torvalds access to boot (in which case you want to say Y to "Root file system 1151da177e4SLinus Torvalds on NFS" as well), because all other machines configure the network 1161da177e4SLinus Torvalds in their startup scripts. 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvaldsconfig IP_PNP_DHCP 1191da177e4SLinus Torvalds bool "IP: DHCP support" 1201da177e4SLinus Torvalds depends on IP_PNP 1211da177e4SLinus Torvalds ---help--- 1221da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1231da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1241da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1251da177e4SLinus Torvalds discovered automatically at boot time using the DHCP protocol (a 1261da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1271da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1281da177e4SLinus Torvalds does DHCP itself, providing all necessary information on the kernel 1291da177e4SLinus Torvalds command line, you can say N here. 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds If unsure, say Y. Note that if you want to use DHCP, a DHCP server 1321da177e4SLinus Torvalds must be operating on your network. Read 133dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvaldsconfig IP_PNP_BOOTP 1361da177e4SLinus Torvalds bool "IP: BOOTP support" 1371da177e4SLinus Torvalds depends on IP_PNP 1381da177e4SLinus Torvalds ---help--- 1391da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1401da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1411da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1421da177e4SLinus Torvalds discovered automatically at boot time using the BOOTP protocol (a 1431da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1441da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1451da177e4SLinus Torvalds does BOOTP itself, providing all necessary information on the kernel 1461da177e4SLinus Torvalds command line, you can say N here. If unsure, say Y. Note that if you 1471da177e4SLinus Torvalds want to use BOOTP, a BOOTP server must be operating on your network. 148dc7a0816SJ. Bruce Fields Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvaldsconfig IP_PNP_RARP 1511da177e4SLinus Torvalds bool "IP: RARP support" 1521da177e4SLinus Torvalds depends on IP_PNP 1531da177e4SLinus Torvalds help 1541da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1551da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1561da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1571da177e4SLinus Torvalds discovered automatically at boot time using the RARP protocol (an 1581da177e4SLinus Torvalds older protocol which is being obsoleted by BOOTP and DHCP), say Y 1591da177e4SLinus Torvalds here. Note that if you want to use RARP, a RARP server must be 1606ded55daSJ. Bruce Fields operating on your network. Read 161dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvaldsconfig NET_IPIP 1641da177e4SLinus Torvalds tristate "IP: tunneling" 165d2acc347SHerbert Xu select INET_TUNNEL 166fd58156eSPravin B Shelar select NET_IP_TUNNEL 1671da177e4SLinus Torvalds ---help--- 1681da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 1691da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 1701da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 1711da177e4SLinus Torvalds encapsulation of IP within IP, which sounds kind of pointless, but 1721da177e4SLinus Torvalds can be useful if you want to make your (or some other) machine 1731da177e4SLinus Torvalds appear on a different network than it physically is, or to use 1741da177e4SLinus Torvalds mobile-IP facilities (allowing laptops to seamlessly move between 1751da177e4SLinus Torvalds networks without changing their IP addresses). 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds Saying Y to this option will produce two modules ( = code which can 1781da177e4SLinus Torvalds be inserted in and removed from the running kernel whenever you 1791da177e4SLinus Torvalds want). Most people won't need this and can say N. 1801da177e4SLinus Torvalds 18100959adeSDmitry Kozlovconfig NET_IPGRE_DEMUX 18200959adeSDmitry Kozlov tristate "IP: GRE demultiplexer" 18300959adeSDmitry Kozlov help 18400959adeSDmitry Kozlov This is helper module to demultiplex GRE packets on GRE version field criteria. 18500959adeSDmitry Kozlov Required by ip_gre and pptp modules. 18600959adeSDmitry Kozlov 187c5441932SPravin B Shelarconfig NET_IP_TUNNEL 188c5441932SPravin B Shelar tristate 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 2151da177e4SLinus Torvaldsconfig IP_MROUTE 2161da177e4SLinus Torvalds bool "IP: multicast routing" 2171da177e4SLinus Torvalds depends on IP_MULTICAST 2181da177e4SLinus Torvalds help 2191da177e4SLinus Torvalds This is used if you want your machine to act as a router for IP 2201da177e4SLinus Torvalds packets that have several destination addresses. It is needed on the 2211da177e4SLinus Torvalds MBONE, a high bandwidth network on top of the Internet which carries 2221da177e4SLinus Torvalds audio and video broadcasts. In order to do that, you would most 2234960c2c6SJean Sacren likely run the program mrouted. If you haven't heard about it, you 2244960c2c6SJean Sacren don't need it. 2251da177e4SLinus Torvalds 226f0ad0860SPatrick McHardyconfig IP_MROUTE_MULTIPLE_TABLES 227f0ad0860SPatrick McHardy bool "IP: multicast policy routing" 22866496d49SPatrick McHardy depends on IP_MROUTE && IP_ADVANCED_ROUTER 229f0ad0860SPatrick McHardy select FIB_RULES 230f0ad0860SPatrick McHardy help 231f0ad0860SPatrick McHardy Normally, a multicast router runs a userspace daemon and decides 232f0ad0860SPatrick McHardy what to do with a multicast packet based on the source and 233f0ad0860SPatrick McHardy destination addresses. If you say Y here, the multicast router 234f0ad0860SPatrick McHardy will also be able to take interfaces and packet marks into 235f0ad0860SPatrick McHardy account and run multiple instances of userspace daemons 236f0ad0860SPatrick McHardy simultaneously, each one handling a single table. 237f0ad0860SPatrick McHardy 238f0ad0860SPatrick McHardy If unsure, say N. 239f0ad0860SPatrick McHardy 2401da177e4SLinus Torvaldsconfig IP_PIMSM_V1 2411da177e4SLinus Torvalds bool "IP: PIM-SM version 1 support" 2421da177e4SLinus Torvalds depends on IP_MROUTE 2431da177e4SLinus Torvalds help 2441da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM (Protocol Independent 2451da177e4SLinus Torvalds Multicast) version 1. This multicast routing protocol is used widely 2461da177e4SLinus Torvalds because Cisco supports it. You need special software to use it 2471da177e4SLinus Torvalds (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more 2481da177e4SLinus Torvalds information about PIM. 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds Say Y if you want to use PIM-SM v1. Note that you can say N here if 2511da177e4SLinus Torvalds you just want to use Dense Mode PIM. 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvaldsconfig IP_PIMSM_V2 2541da177e4SLinus Torvalds bool "IP: PIM-SM version 2 support" 2551da177e4SLinus Torvalds depends on IP_MROUTE 2561da177e4SLinus Torvalds help 2571da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM version 2. In order to use 2581da177e4SLinus Torvalds this, you need an experimental routing daemon supporting it (pimd or 2591da177e4SLinus Torvalds gated-5). This routing protocol is not used widely, so say N unless 2601da177e4SLinus Torvalds you want to play with it. 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvaldsconfig SYN_COOKIES 26357f1553eSFlorian Westphal bool "IP: TCP syncookie support" 2641da177e4SLinus Torvalds ---help--- 2651da177e4SLinus Torvalds Normal TCP/IP networking is open to an attack known as "SYN 2661da177e4SLinus Torvalds flooding". This denial-of-service attack prevents legitimate remote 2671da177e4SLinus Torvalds users from being able to connect to your computer during an ongoing 2681da177e4SLinus Torvalds attack and requires very little work from the attacker, who can 2691da177e4SLinus Torvalds operate from anywhere on the Internet. 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds SYN cookies provide protection against this type of attack. If you 2721da177e4SLinus Torvalds say Y here, the TCP/IP stack will use a cryptographic challenge 2731da177e4SLinus Torvalds protocol known as "SYN cookies" to enable legitimate users to 2741da177e4SLinus Torvalds continue to connect, even when your machine is under attack. There 2751da177e4SLinus Torvalds is no need for the legitimate users to change their TCP/IP software; 2761da177e4SLinus Torvalds SYN cookies work transparently to them. For technical information 2771da177e4SLinus Torvalds about SYN cookies, check out <http://cr.yp.to/syncookies.html>. 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds If you are SYN flooded, the source address reported by the kernel is 2801da177e4SLinus Torvalds likely to have been forged by the attacker; it is only reported as 2811da177e4SLinus Torvalds an aid in tracing the packets to their actual source and should not 2821da177e4SLinus Torvalds be taken as absolute truth. 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds SYN cookies may prevent correct error reporting on clients when the 2851da177e4SLinus Torvalds server is really overloaded. If this happens frequently better turn 2861da177e4SLinus Torvalds them off. 2871da177e4SLinus Torvalds 28857f1553eSFlorian Westphal If you say Y here, you can disable SYN cookies at run time by 28957f1553eSFlorian Westphal saying Y to "/proc file system support" and 2901da177e4SLinus Torvalds "Sysctl support" below and executing the command 2911da177e4SLinus Torvalds 29257f1553eSFlorian Westphal echo 0 > /proc/sys/net/ipv4/tcp_syncookies 2931da177e4SLinus Torvalds 29457f1553eSFlorian Westphal after the /proc file system has been mounted. 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds If unsure, say N. 2971da177e4SLinus Torvalds 2981181412cSSaurabhconfig NET_IPVTI 2991181412cSSaurabh tristate "Virtual (secure) IP: tunneling" 3001181412cSSaurabh select INET_TUNNEL 301f61dd388SPravin B Shelar select NET_IP_TUNNEL 3021181412cSSaurabh depends on INET_XFRM_MODE_TUNNEL 3031181412cSSaurabh ---help--- 3041181412cSSaurabh Tunneling means encapsulating data of one protocol type within 3051181412cSSaurabh another protocol and sending it over a channel that understands the 3061181412cSSaurabh encapsulating protocol. This can be used with xfrm mode tunnel to give 3071181412cSSaurabh the notion of a secure tunnel for IPSEC and then use routing protocol 3081181412cSSaurabh on top. 3091181412cSSaurabh 3108024e028STom Herbertconfig NET_UDP_TUNNEL 3118024e028STom Herbert tristate 3127c5df8faSAndy Zhou select NET_IP_TUNNEL 3138024e028STom Herbert default n 3148024e028STom Herbert 31523461551STom Herbertconfig NET_FOU 31623461551STom Herbert tristate "IP: Foo (IP protocols) over UDP" 31723461551STom Herbert select XFRM 31823461551STom Herbert select NET_UDP_TUNNEL 31923461551STom Herbert ---help--- 32023461551STom Herbert Foo over UDP allows any IP protocol to be directly encapsulated 32123461551STom Herbert over UDP include tunnels (IPIP, GRE, SIT). By encapsulating in UDP 32223461551STom Herbert network mechanisms and optimizations for UDP (such as ECMP 32323461551STom Herbert and RSS) can be leveraged to provide better service. 32423461551STom Herbert 3257c5df8faSAndy Zhouconfig GENEVE 3267c5df8faSAndy Zhou tristate "Generic Network Virtualization Encapsulation (Geneve)" 3277c5df8faSAndy Zhou depends on INET 3287c5df8faSAndy Zhou select NET_UDP_TUNNEL 3297c5df8faSAndy Zhou ---help--- 3307c5df8faSAndy Zhou This allows one to create Geneve virtual interfaces that provide 3317c5df8faSAndy Zhou Layer 2 Networks over Layer 3 Networks. Geneve is often used 3327c5df8faSAndy Zhou to tunnel virtual network infrastructure in virtualized environments. 3337c5df8faSAndy Zhou For more information see: 3347c5df8faSAndy Zhou http://tools.ietf.org/html/draft-gross-geneve-01 3357c5df8faSAndy Zhou 3367c5df8faSAndy Zhou To compile this driver as a module, choose M here: the module 3377c5df8faSAndy Zhou 3387c5df8faSAndy Zhou 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 3611da177e4SLinus Torvalds ---help--- 3621da177e4SLinus Torvalds Support for IPsec ESP. 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds If unsure, say Y. 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvaldsconfig INET_IPCOMP 3671da177e4SLinus Torvalds tristate "IP: IPComp transformation" 368d2acc347SHerbert Xu select INET_XFRM_TUNNEL 3696fccab67SHerbert Xu select XFRM_IPCOMP 3701da177e4SLinus Torvalds ---help--- 3711da177e4SLinus Torvalds Support for IP Payload Compression Protocol (IPComp) (RFC3173), 3721da177e4SLinus Torvalds typically needed for IPsec. 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds If unsure, say Y. 3751da177e4SLinus Torvalds 376d2acc347SHerbert Xuconfig INET_XFRM_TUNNEL 377d2acc347SHerbert Xu tristate 378d2acc347SHerbert Xu select INET_TUNNEL 379d2acc347SHerbert Xu default n 3801da177e4SLinus Torvalds 381d2acc347SHerbert Xuconfig INET_TUNNEL 382d2acc347SHerbert Xu tristate 383d2acc347SHerbert Xu default n 3841da177e4SLinus Torvalds 385b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TRANSPORT 386b59f45d0SHerbert Xu tristate "IP: IPsec transport mode" 387b59f45d0SHerbert Xu default y 388b59f45d0SHerbert Xu select XFRM 389b59f45d0SHerbert Xu ---help--- 390b59f45d0SHerbert Xu Support for IPsec transport mode. 391b59f45d0SHerbert Xu 392b59f45d0SHerbert Xu If unsure, say Y. 393b59f45d0SHerbert Xu 394b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TUNNEL 395b59f45d0SHerbert Xu tristate "IP: IPsec tunnel mode" 396b59f45d0SHerbert Xu default y 397b59f45d0SHerbert Xu select XFRM 398b59f45d0SHerbert Xu ---help--- 399b59f45d0SHerbert Xu Support for IPsec tunnel mode. 400b59f45d0SHerbert Xu 401b59f45d0SHerbert Xu If unsure, say Y. 402b59f45d0SHerbert Xu 4030a69452cSDiego Beltramiconfig INET_XFRM_MODE_BEET 4040a69452cSDiego Beltrami tristate "IP: IPsec BEET mode" 4050a69452cSDiego Beltrami default y 4060a69452cSDiego Beltrami select XFRM 4070a69452cSDiego Beltrami ---help--- 4080a69452cSDiego Beltrami Support for IPsec BEET mode. 4090a69452cSDiego Beltrami 4100a69452cSDiego Beltrami If unsure, say Y. 4110a69452cSDiego Beltrami 41271c87e0cSJan-Bernd Themannconfig INET_LRO 413c5d35571SBen Hutchings tristate "Large Receive Offload (ipv4/tcp)" 414bc8a5397SFrans Pop default y 41571c87e0cSJan-Bernd Themann ---help--- 41671c87e0cSJan-Bernd Themann Support for Large Receive Offload (ipv4/tcp). 41771c87e0cSJan-Bernd Themann 41871c87e0cSJan-Bernd Themann If unsure, say Y. 41971c87e0cSJan-Bernd Themann 42017b085eaSArnaldo Carvalho de Meloconfig INET_DIAG 42117b085eaSArnaldo Carvalho de Melo tristate "INET: socket monitoring interface" 4221da177e4SLinus Torvalds default y 4231da177e4SLinus Torvalds ---help--- 42473c1f4a0SArnaldo Carvalho de Melo Support for INET (TCP, DCCP, etc) socket monitoring interface used by 42573c1f4a0SArnaldo Carvalho de Melo native Linux tools such as ss. ss is included in iproute2, currently 426c996d8b9SMichael Witten downloadable at: 427c996d8b9SMichael Witten 428c996d8b9SMichael Witten http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds If unsure, say Y. 4311da177e4SLinus Torvalds 43217b085eaSArnaldo Carvalho de Meloconfig INET_TCP_DIAG 43317b085eaSArnaldo Carvalho de Melo depends on INET_DIAG 43417b085eaSArnaldo Carvalho de Melo def_tristate INET_DIAG 43517b085eaSArnaldo Carvalho de Melo 436507dd796SPavel Emelyanovconfig INET_UDP_DIAG 4376d62a66eSDavid S. Miller tristate "UDP: socket monitoring interface" 4386d25886eSAnisse Astier depends on INET_DIAG && (IPV6 || IPV6=n) 4396d62a66eSDavid S. Miller default n 4406d62a66eSDavid S. Miller ---help--- 4416d62a66eSDavid S. Miller Support for UDP socket monitoring interface used by the ss tool. 4426d62a66eSDavid S. Miller If unsure, say Y. 443507dd796SPavel Emelyanov 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 5330e57976bSJohn Heffnerconfig TCP_CONG_SCALABLE 5340e57976bSJohn Heffner tristate "Scalable TCP" 5350e57976bSJohn Heffner default n 5360e57976bSJohn Heffner ---help--- 5370e57976bSJohn Heffner Scalable TCP is a sender-side only change to TCP which uses a 5380e57976bSJohn Heffner MIMD congestion control algorithm which has some nice scaling 5390e57976bSJohn Heffner properties, though is known to have fairness issues. 540f4b9479dSBaruch Even See http://www.deneholme.net/tom/scalable/ 541a7868ea6SBaruch Even 5427c106d7eSWong Hoi Sing Edisonconfig TCP_CONG_LP 5437c106d7eSWong Hoi Sing Edison tristate "TCP Low Priority" 5447c106d7eSWong Hoi Sing Edison default n 5457c106d7eSWong Hoi Sing Edison ---help--- 5467c106d7eSWong Hoi Sing Edison TCP Low Priority (TCP-LP), a distributed algorithm whose goal is 547cab00891SMatt LaPlante to utilize only the excess network bandwidth as compared to the 5487c106d7eSWong Hoi Sing Edison ``fair share`` of bandwidth as targeted by TCP. 5497c106d7eSWong Hoi Sing Edison See http://www-ece.rice.edu/networks/TCP-LP/ 5507c106d7eSWong Hoi Sing Edison 55176f10177SBin Zhouconfig TCP_CONG_VENO 55276f10177SBin Zhou tristate "TCP Veno" 55376f10177SBin Zhou default n 55476f10177SBin Zhou ---help--- 55576f10177SBin Zhou TCP Veno is a sender-side only enhancement of TCP to obtain better 55676f10177SBin Zhou throughput over wireless networks. TCP Veno makes use of state 55776f10177SBin Zhou distinguishing to circumvent the difficult judgment of the packet loss 55876f10177SBin Zhou type. TCP Veno cuts down less congestion window in response to random 55976f10177SBin Zhou loss packets. 560631dd1a8SJustin P. Mattock See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186> 56176f10177SBin Zhou 5625ef81475SAngelo P. Castellaniconfig TCP_CONG_YEAH 5635ef81475SAngelo P. Castellani tristate "YeAH TCP" 5642ff011efSDavid S. Miller select TCP_CONG_VEGAS 5655ef81475SAngelo P. Castellani default n 5665ef81475SAngelo P. Castellani ---help--- 5675ef81475SAngelo P. Castellani YeAH-TCP is a sender-side high-speed enabled TCP congestion control 5685ef81475SAngelo P. Castellani algorithm, which uses a mixed loss/delay approach to compute the 5695ef81475SAngelo P. Castellani congestion window. It's design goals target high efficiency, 5705ef81475SAngelo P. Castellani internal, RTT and Reno fairness, resilience to link loss while 5715ef81475SAngelo P. Castellani keeping network elements load as low as possible. 5725ef81475SAngelo P. Castellani 5735ef81475SAngelo P. Castellani For further details look here: 5745ef81475SAngelo P. Castellani http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf 5755ef81475SAngelo P. Castellani 576c462238dSStephen Hemmingerconfig TCP_CONG_ILLINOIS 577c462238dSStephen Hemminger tristate "TCP Illinois" 578c462238dSStephen Hemminger default n 579c462238dSStephen Hemminger ---help--- 58001dd2fbfSMatt LaPlante TCP-Illinois is a sender-side modification of TCP Reno for 581c462238dSStephen Hemminger high speed long delay links. It uses round-trip-time to 582c462238dSStephen Hemminger adjust the alpha and beta parameters to achieve a higher average 583c462238dSStephen Hemminger throughput and maintain fairness. 584c462238dSStephen Hemminger 585c462238dSStephen Hemminger For further details see: 586c462238dSStephen Hemminger http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html 587c462238dSStephen Hemminger 588e3118e83SDaniel Borkmannconfig TCP_CONG_DCTCP 589e3118e83SDaniel Borkmann tristate "DataCenter TCP (DCTCP)" 590e3118e83SDaniel Borkmann default n 591e3118e83SDaniel Borkmann ---help--- 592e3118e83SDaniel Borkmann DCTCP leverages Explicit Congestion Notification (ECN) in the network to 593e3118e83SDaniel Borkmann provide multi-bit feedback to the end hosts. It is designed to provide: 594e3118e83SDaniel Borkmann 595e3118e83SDaniel Borkmann - High burst tolerance (incast due to partition/aggregate), 596e3118e83SDaniel Borkmann - Low latency (short flows, queries), 597e3118e83SDaniel Borkmann - High throughput (continuous data updates, large file transfers) with 598e3118e83SDaniel Borkmann commodity, shallow-buffered switches. 599e3118e83SDaniel Borkmann 600e3118e83SDaniel Borkmann All switches in the data center network running DCTCP must support 601e3118e83SDaniel Borkmann ECN marking and be configured for marking when reaching defined switch 602e3118e83SDaniel Borkmann buffer thresholds. The default ECN marking threshold heuristic for 603e3118e83SDaniel Borkmann DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets 604e3118e83SDaniel Borkmann (~100KB) at 10Gbps, but might need further careful tweaking. 605e3118e83SDaniel Borkmann 606e3118e83SDaniel Borkmann For further details see: 607e3118e83SDaniel Borkmann http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf 608e3118e83SDaniel Borkmann 6093d2573f7SStephen Hemmingerchoice 6103d2573f7SStephen Hemminger prompt "Default TCP congestion control" 611597811ecSStephen Hemminger default DEFAULT_CUBIC 6123d2573f7SStephen Hemminger help 6133d2573f7SStephen Hemminger Select the TCP congestion control that will be used by default 6143d2573f7SStephen Hemminger for all connections. 6153d2573f7SStephen Hemminger 6163d2573f7SStephen Hemminger config DEFAULT_BIC 6173d2573f7SStephen Hemminger bool "Bic" if TCP_CONG_BIC=y 6183d2573f7SStephen Hemminger 6193d2573f7SStephen Hemminger config DEFAULT_CUBIC 6203d2573f7SStephen Hemminger bool "Cubic" if TCP_CONG_CUBIC=y 6213d2573f7SStephen Hemminger 6223d2573f7SStephen Hemminger config DEFAULT_HTCP 6233d2573f7SStephen Hemminger bool "Htcp" if TCP_CONG_HTCP=y 6243d2573f7SStephen Hemminger 625dd2acaa7SJan Engelhardt config DEFAULT_HYBLA 626dd2acaa7SJan Engelhardt bool "Hybla" if TCP_CONG_HYBLA=y 627dd2acaa7SJan Engelhardt 6283d2573f7SStephen Hemminger config DEFAULT_VEGAS 6293d2573f7SStephen Hemminger bool "Vegas" if TCP_CONG_VEGAS=y 6303d2573f7SStephen Hemminger 6316ce1a6dfSJan Engelhardt config DEFAULT_VENO 6326ce1a6dfSJan Engelhardt bool "Veno" if TCP_CONG_VENO=y 6336ce1a6dfSJan Engelhardt 6343d2573f7SStephen Hemminger config DEFAULT_WESTWOOD 6353d2573f7SStephen Hemminger bool "Westwood" if TCP_CONG_WESTWOOD=y 6363d2573f7SStephen Hemminger 637e3118e83SDaniel Borkmann config DEFAULT_DCTCP 638e3118e83SDaniel Borkmann bool "DCTCP" if TCP_CONG_DCTCP=y 639e3118e83SDaniel Borkmann 6403d2573f7SStephen Hemminger config DEFAULT_RENO 6413d2573f7SStephen Hemminger bool "Reno" 6423d2573f7SStephen Hemmingerendchoice 6433d2573f7SStephen Hemminger 6443d2573f7SStephen Hemmingerendif 64583803034SStephen Hemminger 646597811ecSStephen Hemmingerconfig TCP_CONG_CUBIC 6476c360767SDavid S. Miller tristate 648a6484045SDavid S. Miller depends on !TCP_CONG_ADVANCED 649a6484045SDavid S. Miller default y 650a6484045SDavid S. Miller 6513d2573f7SStephen Hemmingerconfig DEFAULT_TCP_CONG 6523d2573f7SStephen Hemminger string 6533d2573f7SStephen Hemminger default "bic" if DEFAULT_BIC 6543d2573f7SStephen Hemminger default "cubic" if DEFAULT_CUBIC 6553d2573f7SStephen Hemminger default "htcp" if DEFAULT_HTCP 656dd2acaa7SJan Engelhardt default "hybla" if DEFAULT_HYBLA 6573d2573f7SStephen Hemminger default "vegas" if DEFAULT_VEGAS 6583d2573f7SStephen Hemminger default "westwood" if DEFAULT_WESTWOOD 6596ce1a6dfSJan Engelhardt default "veno" if DEFAULT_VENO 6603d2573f7SStephen Hemminger default "reno" if DEFAULT_RENO 661e3118e83SDaniel Borkmann default "dctcp" if DEFAULT_DCTCP 662597811ecSStephen Hemminger default "cubic" 6633d2573f7SStephen Hemminger 664cfb6eeb4SYOSHIFUJI Hideakiconfig TCP_MD5SIG 66544fbe920SKees Cook bool "TCP: MD5 Signature Option support (RFC2385)" 666cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO 667cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO_MD5 668cfb6eeb4SYOSHIFUJI Hideaki ---help--- 6693dde6ad8SDavid Sterba RFC2385 specifies a method of giving MD5 protection to TCP sessions. 670cfb6eeb4SYOSHIFUJI Hideaki Its main (only?) use is to protect BGP sessions between core routers 671cfb6eeb4SYOSHIFUJI Hideaki on the Internet. 672cfb6eeb4SYOSHIFUJI Hideaki 673cfb6eeb4SYOSHIFUJI Hideaki If unsure, say N. 674