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 12936bb14cSAdrian Bunk <http://www.savetz.com/mbone/>. Information about the multicast 131da177e4SLinus Torvalds capabilities of the various network cards is contained in 141da177e4SLinus Torvalds <file:Documentation/networking/multicast.txt>. For most people, it's 151da177e4SLinus Torvalds safe to say N. 161da177e4SLinus Torvalds 171da177e4SLinus Torvaldsconfig IP_ADVANCED_ROUTER 181da177e4SLinus Torvalds bool "IP: advanced router" 191da177e4SLinus Torvalds ---help--- 201da177e4SLinus Torvalds If you intend to run your Linux box mostly as a router, i.e. as a 211da177e4SLinus Torvalds computer that forwards and redistributes network packets, say Y; you 221da177e4SLinus Torvalds will then be presented with several options that allow more precise 231da177e4SLinus Torvalds control about the routing process. 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds The answer to this question won't directly affect the kernel: 261da177e4SLinus Torvalds answering N will just cause the configurator to skip all the 271da177e4SLinus Torvalds questions about advanced routing. 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds Note that your box can only act as a router if you enable IP 301da177e4SLinus Torvalds forwarding in your kernel; you can do that by saying Y to "/proc 311da177e4SLinus Torvalds file system support" and "Sysctl support" below and executing the 321da177e4SLinus Torvalds line 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds echo "1" > /proc/sys/net/ipv4/ip_forward 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds at boot time after the /proc file system has been mounted. 371da177e4SLinus Torvalds 38b2cc46a8SJesper Dangaard Brouer If you turn on IP forwarding, you should consider the rp_filter, which 391da177e4SLinus Torvalds automatically rejects incoming packets if the routing table entry 401da177e4SLinus Torvalds for their source address doesn't match the network interface they're 411da177e4SLinus Torvalds arriving on. This has security advantages because it prevents the 421da177e4SLinus Torvalds so-called IP spoofing, however it can pose problems if you use 431da177e4SLinus Torvalds asymmetric routing (packets from you to a host take a different path 441da177e4SLinus Torvalds than packets from that host to you) or if you operate a non-routing 451da177e4SLinus Torvalds host which has several IP addresses on different interfaces. To turn 46d7394372SDave Jones rp_filter on use: 471da177e4SLinus Torvalds 48d7394372SDave Jones echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter 49750e9fadSNicolas Dichtel or 50d7394372SDave Jones echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter 511da177e4SLinus Torvalds 52b2cc46a8SJesper Dangaard Brouer Note that some distributions enable it in startup scripts. 53d18921a0SJesper Dangaard Brouer For details about rp_filter strict and loose mode read 54d18921a0SJesper Dangaard Brouer <file:Documentation/networking/ip-sysctl.txt>. 55b2cc46a8SJesper Dangaard Brouer 561da177e4SLinus Torvalds If unsure, say N here. 571da177e4SLinus Torvalds 5866a2f7fdSStephen Hemmingerconfig IP_FIB_TRIE_STATS 5966a2f7fdSStephen Hemminger bool "FIB TRIE statistics" 603630b7c0SDavid S. Miller depends on IP_ADVANCED_ROUTER 6166a2f7fdSStephen Hemminger ---help--- 6266a2f7fdSStephen Hemminger Keep track of statistics on structure of FIB TRIE table. 6366a2f7fdSStephen Hemminger Useful for testing and measuring TRIE performance. 6466a2f7fdSStephen Hemminger 651da177e4SLinus Torvaldsconfig IP_MULTIPLE_TABLES 661da177e4SLinus Torvalds bool "IP: policy routing" 671da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 68e1ef4bf2SThomas Graf select FIB_RULES 691da177e4SLinus Torvalds ---help--- 701da177e4SLinus Torvalds Normally, a router decides what to do with a received packet based 711da177e4SLinus Torvalds solely on the packet's final destination address. If you say Y here, 721da177e4SLinus Torvalds the Linux router will also be able to take the packet's source 731da177e4SLinus Torvalds address into account. Furthermore, the TOS (Type-Of-Service) field 741da177e4SLinus Torvalds of the packet can be used for routing decisions as well. 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds If you are interested in this, please see the preliminary 771da177e4SLinus Torvalds documentation at <http://www.compendium.com.ar/policy-routing.txt> 781da177e4SLinus Torvalds and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>. 791da177e4SLinus Torvalds You will need supporting software from 801da177e4SLinus Torvalds <ftp://ftp.tux.org/pub/net/ip-routing/>. 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds If unsure, say N. 831da177e4SLinus Torvalds 841da177e4SLinus Torvaldsconfig IP_ROUTE_MULTIPATH 851da177e4SLinus Torvalds bool "IP: equal cost multipath" 861da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 871da177e4SLinus Torvalds help 881da177e4SLinus Torvalds Normally, the routing tables specify a single action to be taken in 891da177e4SLinus Torvalds a deterministic manner for a given packet. If you say Y here 901da177e4SLinus Torvalds however, it becomes possible to attach several actions to a packet 911da177e4SLinus Torvalds pattern, in effect specifying several alternative paths to travel 921da177e4SLinus Torvalds for those packets. The router considers all these paths to be of 931da177e4SLinus Torvalds equal "cost" and chooses one of them in a non-deterministic fashion 941da177e4SLinus Torvalds if a matching packet arrives. 951da177e4SLinus Torvalds 961da177e4SLinus Torvaldsconfig IP_ROUTE_VERBOSE 971da177e4SLinus Torvalds bool "IP: verbose route monitoring" 981da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 991da177e4SLinus Torvalds help 1001da177e4SLinus Torvalds If you say Y here, which is recommended, then the kernel will print 1011da177e4SLinus Torvalds verbose messages regarding the routing, for example warnings about 1021da177e4SLinus Torvalds received packets which look strange and could be evidence of an 1031da177e4SLinus Torvalds attack or a misconfigured system somewhere. The information is 1041da177e4SLinus Torvalds handled by the klogd daemon which is responsible for kernel messages 1051da177e4SLinus Torvalds ("man klogd"). 1061da177e4SLinus Torvalds 107c7066f70SPatrick McHardyconfig IP_ROUTE_CLASSID 108c7066f70SPatrick McHardy bool 109c7066f70SPatrick McHardy 1101da177e4SLinus Torvaldsconfig IP_PNP 1111da177e4SLinus Torvalds bool "IP: kernel level autoconfiguration" 1121da177e4SLinus Torvalds help 1131da177e4SLinus Torvalds This enables automatic configuration of IP addresses of devices and 1141da177e4SLinus Torvalds of the routing table during kernel boot, based on either information 1151da177e4SLinus Torvalds supplied on the kernel command line or by BOOTP or RARP protocols. 1161da177e4SLinus Torvalds You need to say Y only for diskless machines requiring network 1171da177e4SLinus Torvalds access to boot (in which case you want to say Y to "Root file system 1181da177e4SLinus Torvalds on NFS" as well), because all other machines configure the network 1191da177e4SLinus Torvalds in their startup scripts. 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvaldsconfig IP_PNP_DHCP 1221da177e4SLinus Torvalds bool "IP: DHCP support" 1231da177e4SLinus Torvalds depends on IP_PNP 1241da177e4SLinus Torvalds ---help--- 1251da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1261da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1271da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1281da177e4SLinus Torvalds discovered automatically at boot time using the DHCP protocol (a 1291da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1301da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1311da177e4SLinus Torvalds does DHCP itself, providing all necessary information on the kernel 1321da177e4SLinus Torvalds command line, you can say N here. 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds If unsure, say Y. Note that if you want to use DHCP, a DHCP server 1351da177e4SLinus Torvalds must be operating on your network. Read 136dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvaldsconfig IP_PNP_BOOTP 1391da177e4SLinus Torvalds bool "IP: BOOTP support" 1401da177e4SLinus Torvalds depends on IP_PNP 1411da177e4SLinus Torvalds ---help--- 1421da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1431da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1441da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1451da177e4SLinus Torvalds discovered automatically at boot time using the BOOTP protocol (a 1461da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1471da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1481da177e4SLinus Torvalds does BOOTP itself, providing all necessary information on the kernel 1491da177e4SLinus Torvalds command line, you can say N here. If unsure, say Y. Note that if you 1501da177e4SLinus Torvalds want to use BOOTP, a BOOTP server must be operating on your network. 151dc7a0816SJ. Bruce Fields Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvaldsconfig IP_PNP_RARP 1541da177e4SLinus Torvalds bool "IP: RARP support" 1551da177e4SLinus Torvalds depends on IP_PNP 1561da177e4SLinus Torvalds help 1571da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1581da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1591da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1601da177e4SLinus Torvalds discovered automatically at boot time using the RARP protocol (an 1611da177e4SLinus Torvalds older protocol which is being obsoleted by BOOTP and DHCP), say Y 1621da177e4SLinus Torvalds here. Note that if you want to use RARP, a RARP server must be 1636ded55daSJ. Bruce Fields operating on your network. Read 164dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvaldsconfig NET_IPIP 1671da177e4SLinus Torvalds tristate "IP: tunneling" 168d2acc347SHerbert Xu select INET_TUNNEL 169fd58156eSPravin B Shelar select NET_IP_TUNNEL 1701da177e4SLinus Torvalds ---help--- 1711da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 1721da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 1731da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 1741da177e4SLinus Torvalds encapsulation of IP within IP, which sounds kind of pointless, but 1751da177e4SLinus Torvalds can be useful if you want to make your (or some other) machine 1761da177e4SLinus Torvalds appear on a different network than it physically is, or to use 1771da177e4SLinus Torvalds mobile-IP facilities (allowing laptops to seamlessly move between 1781da177e4SLinus Torvalds networks without changing their IP addresses). 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds Saying Y to this option will produce two modules ( = code which can 1811da177e4SLinus Torvalds be inserted in and removed from the running kernel whenever you 1821da177e4SLinus Torvalds want). Most people won't need this and can say N. 1831da177e4SLinus Torvalds 18400959adeSDmitry Kozlovconfig NET_IPGRE_DEMUX 18500959adeSDmitry Kozlov tristate "IP: GRE demultiplexer" 18600959adeSDmitry Kozlov help 18700959adeSDmitry Kozlov This is helper module to demultiplex GRE packets on GRE version field criteria. 18800959adeSDmitry Kozlov Required by ip_gre and pptp modules. 18900959adeSDmitry Kozlov 190c5441932SPravin B Shelarconfig NET_IP_TUNNEL 191c5441932SPravin B Shelar tristate 192c5441932SPravin B Shelar default n 193c5441932SPravin B Shelar 1941da177e4SLinus Torvaldsconfig NET_IPGRE 1951da177e4SLinus Torvalds tristate "IP: GRE tunnels over IP" 19621a180cdSDavid S. Miller depends on (IPV6 || IPV6=n) && NET_IPGRE_DEMUX 197c5441932SPravin B Shelar select NET_IP_TUNNEL 1981da177e4SLinus Torvalds help 1991da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 2001da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 2011da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 2021da177e4SLinus Torvalds GRE (Generic Routing Encapsulation) and at this time allows 2031da177e4SLinus Torvalds encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. 2041da177e4SLinus Torvalds This driver is useful if the other endpoint is a Cisco router: Cisco 2051da177e4SLinus Torvalds likes GRE much better than the other Linux tunneling driver ("IP 2061da177e4SLinus Torvalds tunneling" above). In addition, GRE allows multicast redistribution 2071da177e4SLinus Torvalds through the tunnel. 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvaldsconfig NET_IPGRE_BROADCAST 2101da177e4SLinus Torvalds bool "IP: broadcast GRE over IP" 2111da177e4SLinus Torvalds depends on IP_MULTICAST && NET_IPGRE 2121da177e4SLinus Torvalds help 2131da177e4SLinus Torvalds One application of GRE/IP is to construct a broadcast WAN (Wide Area 2141da177e4SLinus Torvalds Network), which looks like a normal Ethernet LAN (Local Area 2151da177e4SLinus Torvalds Network), but can be distributed all over the Internet. If you want 2161da177e4SLinus Torvalds to do that, say Y here and to "IP multicast routing" below. 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvaldsconfig IP_MROUTE 2191da177e4SLinus Torvalds bool "IP: multicast routing" 2201da177e4SLinus Torvalds depends on IP_MULTICAST 2211da177e4SLinus Torvalds help 2221da177e4SLinus Torvalds This is used if you want your machine to act as a router for IP 2231da177e4SLinus Torvalds packets that have several destination addresses. It is needed on the 2241da177e4SLinus Torvalds MBONE, a high bandwidth network on top of the Internet which carries 2251da177e4SLinus Torvalds audio and video broadcasts. In order to do that, you would most 2261da177e4SLinus Torvalds likely run the program mrouted. Information about the multicast 2271da177e4SLinus Torvalds capabilities of the various network cards is contained in 2281da177e4SLinus Torvalds <file:Documentation/networking/multicast.txt>. If you haven't heard 2291da177e4SLinus Torvalds about it, you 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 ARPD 268e61a4b63STimo Teräs bool "IP: ARP daemon support" 2691da177e4SLinus Torvalds ---help--- 270e61a4b63STimo Teräs The kernel maintains an internal cache which maps IP addresses to 271211ed865SPaul Gortmaker hardware addresses on the local network, so that Ethernet 272211ed865SPaul Gortmaker frames are sent to the proper address on the physical networking 273e61a4b63STimo Teräs layer. Normally, kernel uses the ARP protocol to resolve these 274e61a4b63STimo Teräs mappings. 2751da177e4SLinus Torvalds 276e61a4b63STimo Teräs Saying Y here adds support to have an user space daemon to do this 277e61a4b63STimo Teräs resolution instead. This is useful for implementing an alternate 278e61a4b63STimo Teräs address resolution protocol (e.g. NHRP on mGRE tunnels) and also for 279e61a4b63STimo Teräs testing purposes. 2801da177e4SLinus Torvalds 281e61a4b63STimo Teräs If unsure, say N. 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvaldsconfig SYN_COOKIES 28457f1553eSFlorian Westphal bool "IP: TCP syncookie support" 2851da177e4SLinus Torvalds ---help--- 2861da177e4SLinus Torvalds Normal TCP/IP networking is open to an attack known as "SYN 2871da177e4SLinus Torvalds flooding". This denial-of-service attack prevents legitimate remote 2881da177e4SLinus Torvalds users from being able to connect to your computer during an ongoing 2891da177e4SLinus Torvalds attack and requires very little work from the attacker, who can 2901da177e4SLinus Torvalds operate from anywhere on the Internet. 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds SYN cookies provide protection against this type of attack. If you 2931da177e4SLinus Torvalds say Y here, the TCP/IP stack will use a cryptographic challenge 2941da177e4SLinus Torvalds protocol known as "SYN cookies" to enable legitimate users to 2951da177e4SLinus Torvalds continue to connect, even when your machine is under attack. There 2961da177e4SLinus Torvalds is no need for the legitimate users to change their TCP/IP software; 2971da177e4SLinus Torvalds SYN cookies work transparently to them. For technical information 2981da177e4SLinus Torvalds about SYN cookies, check out <http://cr.yp.to/syncookies.html>. 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds If you are SYN flooded, the source address reported by the kernel is 3011da177e4SLinus Torvalds likely to have been forged by the attacker; it is only reported as 3021da177e4SLinus Torvalds an aid in tracing the packets to their actual source and should not 3031da177e4SLinus Torvalds be taken as absolute truth. 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds SYN cookies may prevent correct error reporting on clients when the 3061da177e4SLinus Torvalds server is really overloaded. If this happens frequently better turn 3071da177e4SLinus Torvalds them off. 3081da177e4SLinus Torvalds 30957f1553eSFlorian Westphal If you say Y here, you can disable SYN cookies at run time by 31057f1553eSFlorian Westphal saying Y to "/proc file system support" and 3111da177e4SLinus Torvalds "Sysctl support" below and executing the command 3121da177e4SLinus Torvalds 31357f1553eSFlorian Westphal echo 0 > /proc/sys/net/ipv4/tcp_syncookies 3141da177e4SLinus Torvalds 31557f1553eSFlorian Westphal after the /proc file system has been mounted. 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds If unsure, say N. 3181da177e4SLinus Torvalds 3191181412cSSaurabhconfig NET_IPVTI 3201181412cSSaurabh tristate "Virtual (secure) IP: tunneling" 3211181412cSSaurabh select INET_TUNNEL 322f61dd388SPravin B Shelar select NET_IP_TUNNEL 3231181412cSSaurabh depends on INET_XFRM_MODE_TUNNEL 3241181412cSSaurabh ---help--- 3251181412cSSaurabh Tunneling means encapsulating data of one protocol type within 3261181412cSSaurabh another protocol and sending it over a channel that understands the 3271181412cSSaurabh encapsulating protocol. This can be used with xfrm mode tunnel to give 3281181412cSSaurabh the notion of a secure tunnel for IPSEC and then use routing protocol 3291181412cSSaurabh on top. 3301181412cSSaurabh 3311da177e4SLinus Torvaldsconfig INET_AH 3321da177e4SLinus Torvalds tristate "IP: AH transformation" 3337e152524SJan Beulich select XFRM_ALGO 3341da177e4SLinus Torvalds select CRYPTO 3351da177e4SLinus Torvalds select CRYPTO_HMAC 3361da177e4SLinus Torvalds select CRYPTO_MD5 3371da177e4SLinus Torvalds select CRYPTO_SHA1 3381da177e4SLinus Torvalds ---help--- 3391da177e4SLinus Torvalds Support for IPsec AH. 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds If unsure, say Y. 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvaldsconfig INET_ESP 3441da177e4SLinus Torvalds tristate "IP: ESP transformation" 3457e152524SJan Beulich select XFRM_ALGO 3461da177e4SLinus Torvalds select CRYPTO 347ed58dd41SHerbert Xu select CRYPTO_AUTHENC 3481da177e4SLinus Torvalds select CRYPTO_HMAC 3491da177e4SLinus Torvalds select CRYPTO_MD5 3506b7326c8SHerbert Xu select CRYPTO_CBC 3511da177e4SLinus Torvalds select CRYPTO_SHA1 3521da177e4SLinus Torvalds select CRYPTO_DES 3531da177e4SLinus Torvalds ---help--- 3541da177e4SLinus Torvalds Support for IPsec ESP. 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds If unsure, say Y. 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvaldsconfig INET_IPCOMP 3591da177e4SLinus Torvalds tristate "IP: IPComp transformation" 360d2acc347SHerbert Xu select INET_XFRM_TUNNEL 3616fccab67SHerbert Xu select XFRM_IPCOMP 3621da177e4SLinus Torvalds ---help--- 3631da177e4SLinus Torvalds Support for IP Payload Compression Protocol (IPComp) (RFC3173), 3641da177e4SLinus Torvalds typically needed for IPsec. 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds If unsure, say Y. 3671da177e4SLinus Torvalds 368d2acc347SHerbert Xuconfig INET_XFRM_TUNNEL 369d2acc347SHerbert Xu tristate 370d2acc347SHerbert Xu select INET_TUNNEL 371d2acc347SHerbert Xu default n 3721da177e4SLinus Torvalds 373d2acc347SHerbert Xuconfig INET_TUNNEL 374d2acc347SHerbert Xu tristate 375d2acc347SHerbert Xu default n 3761da177e4SLinus Torvalds 377b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TRANSPORT 378b59f45d0SHerbert Xu tristate "IP: IPsec transport mode" 379b59f45d0SHerbert Xu default y 380b59f45d0SHerbert Xu select XFRM 381b59f45d0SHerbert Xu ---help--- 382b59f45d0SHerbert Xu Support for IPsec transport mode. 383b59f45d0SHerbert Xu 384b59f45d0SHerbert Xu If unsure, say Y. 385b59f45d0SHerbert Xu 386b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TUNNEL 387b59f45d0SHerbert Xu tristate "IP: IPsec tunnel mode" 388b59f45d0SHerbert Xu default y 389b59f45d0SHerbert Xu select XFRM 390b59f45d0SHerbert Xu ---help--- 391b59f45d0SHerbert Xu Support for IPsec tunnel mode. 392b59f45d0SHerbert Xu 393b59f45d0SHerbert Xu If unsure, say Y. 394b59f45d0SHerbert Xu 3950a69452cSDiego Beltramiconfig INET_XFRM_MODE_BEET 3960a69452cSDiego Beltrami tristate "IP: IPsec BEET mode" 3970a69452cSDiego Beltrami default y 3980a69452cSDiego Beltrami select XFRM 3990a69452cSDiego Beltrami ---help--- 4000a69452cSDiego Beltrami Support for IPsec BEET mode. 4010a69452cSDiego Beltrami 4020a69452cSDiego Beltrami If unsure, say Y. 4030a69452cSDiego Beltrami 40471c87e0cSJan-Bernd Themannconfig INET_LRO 405c5d35571SBen Hutchings tristate "Large Receive Offload (ipv4/tcp)" 406bc8a5397SFrans Pop default y 40771c87e0cSJan-Bernd Themann ---help--- 40871c87e0cSJan-Bernd Themann Support for Large Receive Offload (ipv4/tcp). 40971c87e0cSJan-Bernd Themann 41071c87e0cSJan-Bernd Themann If unsure, say Y. 41171c87e0cSJan-Bernd Themann 41217b085eaSArnaldo Carvalho de Meloconfig INET_DIAG 41317b085eaSArnaldo Carvalho de Melo tristate "INET: socket monitoring interface" 4141da177e4SLinus Torvalds default y 4151da177e4SLinus Torvalds ---help--- 41673c1f4a0SArnaldo Carvalho de Melo Support for INET (TCP, DCCP, etc) socket monitoring interface used by 41773c1f4a0SArnaldo Carvalho de Melo native Linux tools such as ss. ss is included in iproute2, currently 418c996d8b9SMichael Witten downloadable at: 419c996d8b9SMichael Witten 420c996d8b9SMichael Witten http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds If unsure, say Y. 4231da177e4SLinus Torvalds 42417b085eaSArnaldo Carvalho de Meloconfig INET_TCP_DIAG 42517b085eaSArnaldo Carvalho de Melo depends on INET_DIAG 42617b085eaSArnaldo Carvalho de Melo def_tristate INET_DIAG 42717b085eaSArnaldo Carvalho de Melo 428507dd796SPavel Emelyanovconfig INET_UDP_DIAG 4296d62a66eSDavid S. Miller tristate "UDP: socket monitoring interface" 4306d25886eSAnisse Astier depends on INET_DIAG && (IPV6 || IPV6=n) 4316d62a66eSDavid S. Miller default n 4326d62a66eSDavid S. Miller ---help--- 4336d62a66eSDavid S. Miller Support for UDP socket monitoring interface used by the ss tool. 4346d62a66eSDavid S. Miller If unsure, say Y. 435507dd796SPavel Emelyanov 4363d2573f7SStephen Hemmingermenuconfig TCP_CONG_ADVANCED 437a6484045SDavid S. Miller bool "TCP: advanced congestion control" 438a6484045SDavid S. Miller ---help--- 439a6484045SDavid S. Miller Support for selection of various TCP congestion control 440a6484045SDavid S. Miller modules. 441a6484045SDavid S. Miller 442a6484045SDavid S. Miller Nearly all users can safely say no here, and a safe default 443597811ecSStephen Hemminger selection will be made (CUBIC with new Reno as a fallback). 444a6484045SDavid S. Miller 445a6484045SDavid S. Miller If unsure, say N. 446a6484045SDavid S. Miller 4473d2573f7SStephen Hemmingerif TCP_CONG_ADVANCED 44883803034SStephen Hemminger 44983803034SStephen Hemmingerconfig TCP_CONG_BIC 45083803034SStephen Hemminger tristate "Binary Increase Congestion (BIC) control" 451597811ecSStephen Hemminger default m 45283803034SStephen Hemminger ---help--- 45383803034SStephen Hemminger BIC-TCP is a sender-side only change that ensures a linear RTT 45483803034SStephen Hemminger fairness under large windows while offering both scalability and 45583803034SStephen Hemminger bounded TCP-friendliness. The protocol combines two schemes 45683803034SStephen Hemminger called additive increase and binary search increase. When the 45783803034SStephen Hemminger congestion window is large, additive increase with a large 45883803034SStephen Hemminger increment ensures linear RTT fairness as well as good 45983803034SStephen Hemminger scalability. Under small congestion windows, binary search 46083803034SStephen Hemminger increase provides TCP friendliness. 46183803034SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/ 46283803034SStephen Hemminger 463df3271f3SStephen Hemmingerconfig TCP_CONG_CUBIC 464df3271f3SStephen Hemminger tristate "CUBIC TCP" 465597811ecSStephen Hemminger default y 466df3271f3SStephen Hemminger ---help--- 467df3271f3SStephen Hemminger This is version 2.0 of BIC-TCP which uses a cubic growth function 468df3271f3SStephen Hemminger among other techniques. 469df3271f3SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf 470df3271f3SStephen Hemminger 47187270762SStephen Hemmingerconfig TCP_CONG_WESTWOOD 47287270762SStephen Hemminger tristate "TCP Westwood+" 47387270762SStephen Hemminger default m 47487270762SStephen Hemminger ---help--- 47587270762SStephen Hemminger TCP Westwood+ is a sender-side only modification of the TCP Reno 47687270762SStephen Hemminger protocol stack that optimizes the performance of TCP congestion 47787270762SStephen Hemminger control. It is based on end-to-end bandwidth estimation to set 47887270762SStephen Hemminger congestion window and slow start threshold after a congestion 47987270762SStephen Hemminger episode. Using this estimation, TCP Westwood+ adaptively sets a 48087270762SStephen Hemminger slow start threshold and a congestion window which takes into 48187270762SStephen Hemminger account the bandwidth used at the time congestion is experienced. 48287270762SStephen Hemminger TCP Westwood+ significantly increases fairness wrt TCP Reno in 48387270762SStephen Hemminger wired networks and throughput over wireless links. 48487270762SStephen Hemminger 485a7868ea6SBaruch Evenconfig TCP_CONG_HTCP 486a7868ea6SBaruch Even tristate "H-TCP" 487a7868ea6SBaruch Even default m 488a7868ea6SBaruch Even ---help--- 489a7868ea6SBaruch Even H-TCP is a send-side only modifications of the TCP Reno 490a7868ea6SBaruch Even protocol stack that optimizes the performance of TCP 491a7868ea6SBaruch Even congestion control for high speed network links. It uses a 492a7868ea6SBaruch Even modeswitch to change the alpha and beta parameters of TCP Reno 493a7868ea6SBaruch Even based on network conditions and in a way so as to be fair with 494a7868ea6SBaruch Even other Reno and H-TCP flows. 495a7868ea6SBaruch Even 496a628d29bSJohn Heffnerconfig TCP_CONG_HSTCP 497a628d29bSJohn Heffner tristate "High Speed TCP" 498a628d29bSJohn Heffner default n 499a628d29bSJohn Heffner ---help--- 500a628d29bSJohn Heffner Sally Floyd's High Speed TCP (RFC 3649) congestion control. 501a628d29bSJohn Heffner A modification to TCP's congestion control mechanism for use 502a628d29bSJohn Heffner with large congestion windows. A table indicates how much to 503a628d29bSJohn Heffner increase the congestion window by when an ACK is received. 504a628d29bSJohn Heffner For more detail see http://www.icir.org/floyd/hstcp.html 505a628d29bSJohn Heffner 506835b3f0cSDaniele Lacameraconfig TCP_CONG_HYBLA 507835b3f0cSDaniele Lacamera tristate "TCP-Hybla congestion control algorithm" 508835b3f0cSDaniele Lacamera default n 509835b3f0cSDaniele Lacamera ---help--- 510835b3f0cSDaniele Lacamera TCP-Hybla is a sender-side only change that eliminates penalization of 511835b3f0cSDaniele Lacamera long-RTT, large-bandwidth connections, like when satellite legs are 51244c09201SMatt LaPlante involved, especially when sharing a common bottleneck with normal 513835b3f0cSDaniele Lacamera terrestrial connections. 514835b3f0cSDaniele Lacamera 515b87d8561SStephen Hemmingerconfig TCP_CONG_VEGAS 516b87d8561SStephen Hemminger tristate "TCP Vegas" 517b87d8561SStephen Hemminger default n 518b87d8561SStephen Hemminger ---help--- 519b87d8561SStephen Hemminger TCP Vegas is a sender-side only change to TCP that anticipates 520b87d8561SStephen Hemminger the onset of congestion by estimating the bandwidth. TCP Vegas 521b87d8561SStephen Hemminger adjusts the sending rate by modifying the congestion 522b87d8561SStephen Hemminger window. TCP Vegas should provide less packet loss, but it is 523b87d8561SStephen Hemminger not as aggressive as TCP Reno. 524b87d8561SStephen Hemminger 5250e57976bSJohn Heffnerconfig TCP_CONG_SCALABLE 5260e57976bSJohn Heffner tristate "Scalable TCP" 5270e57976bSJohn Heffner default n 5280e57976bSJohn Heffner ---help--- 5290e57976bSJohn Heffner Scalable TCP is a sender-side only change to TCP which uses a 5300e57976bSJohn Heffner MIMD congestion control algorithm which has some nice scaling 5310e57976bSJohn Heffner properties, though is known to have fairness issues. 532f4b9479dSBaruch Even See http://www.deneholme.net/tom/scalable/ 533a7868ea6SBaruch Even 5347c106d7eSWong Hoi Sing Edisonconfig TCP_CONG_LP 5357c106d7eSWong Hoi Sing Edison tristate "TCP Low Priority" 5367c106d7eSWong Hoi Sing Edison default n 5377c106d7eSWong Hoi Sing Edison ---help--- 5387c106d7eSWong Hoi Sing Edison TCP Low Priority (TCP-LP), a distributed algorithm whose goal is 539cab00891SMatt LaPlante to utilize only the excess network bandwidth as compared to the 5407c106d7eSWong Hoi Sing Edison ``fair share`` of bandwidth as targeted by TCP. 5417c106d7eSWong Hoi Sing Edison See http://www-ece.rice.edu/networks/TCP-LP/ 5427c106d7eSWong Hoi Sing Edison 54376f10177SBin Zhouconfig TCP_CONG_VENO 54476f10177SBin Zhou tristate "TCP Veno" 54576f10177SBin Zhou default n 54676f10177SBin Zhou ---help--- 54776f10177SBin Zhou TCP Veno is a sender-side only enhancement of TCP to obtain better 54876f10177SBin Zhou throughput over wireless networks. TCP Veno makes use of state 54976f10177SBin Zhou distinguishing to circumvent the difficult judgment of the packet loss 55076f10177SBin Zhou type. TCP Veno cuts down less congestion window in response to random 55176f10177SBin Zhou loss packets. 552631dd1a8SJustin P. Mattock See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186> 55376f10177SBin Zhou 5545ef81475SAngelo P. Castellaniconfig TCP_CONG_YEAH 5555ef81475SAngelo P. Castellani tristate "YeAH TCP" 5562ff011efSDavid S. Miller select TCP_CONG_VEGAS 5575ef81475SAngelo P. Castellani default n 5585ef81475SAngelo P. Castellani ---help--- 5595ef81475SAngelo P. Castellani YeAH-TCP is a sender-side high-speed enabled TCP congestion control 5605ef81475SAngelo P. Castellani algorithm, which uses a mixed loss/delay approach to compute the 5615ef81475SAngelo P. Castellani congestion window. It's design goals target high efficiency, 5625ef81475SAngelo P. Castellani internal, RTT and Reno fairness, resilience to link loss while 5635ef81475SAngelo P. Castellani keeping network elements load as low as possible. 5645ef81475SAngelo P. Castellani 5655ef81475SAngelo P. Castellani For further details look here: 5665ef81475SAngelo P. Castellani http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf 5675ef81475SAngelo P. Castellani 568c462238dSStephen Hemmingerconfig TCP_CONG_ILLINOIS 569c462238dSStephen Hemminger tristate "TCP Illinois" 570c462238dSStephen Hemminger default n 571c462238dSStephen Hemminger ---help--- 57201dd2fbfSMatt LaPlante TCP-Illinois is a sender-side modification of TCP Reno for 573c462238dSStephen Hemminger high speed long delay links. It uses round-trip-time to 574c462238dSStephen Hemminger adjust the alpha and beta parameters to achieve a higher average 575c462238dSStephen Hemminger throughput and maintain fairness. 576c462238dSStephen Hemminger 577c462238dSStephen Hemminger For further details see: 578c462238dSStephen Hemminger http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html 579c462238dSStephen Hemminger 5803d2573f7SStephen Hemmingerchoice 5813d2573f7SStephen Hemminger prompt "Default TCP congestion control" 582597811ecSStephen Hemminger default DEFAULT_CUBIC 5833d2573f7SStephen Hemminger help 5843d2573f7SStephen Hemminger Select the TCP congestion control that will be used by default 5853d2573f7SStephen Hemminger for all connections. 5863d2573f7SStephen Hemminger 5873d2573f7SStephen Hemminger config DEFAULT_BIC 5883d2573f7SStephen Hemminger bool "Bic" if TCP_CONG_BIC=y 5893d2573f7SStephen Hemminger 5903d2573f7SStephen Hemminger config DEFAULT_CUBIC 5913d2573f7SStephen Hemminger bool "Cubic" if TCP_CONG_CUBIC=y 5923d2573f7SStephen Hemminger 5933d2573f7SStephen Hemminger config DEFAULT_HTCP 5943d2573f7SStephen Hemminger bool "Htcp" if TCP_CONG_HTCP=y 5953d2573f7SStephen Hemminger 596dd2acaa7SJan Engelhardt config DEFAULT_HYBLA 597dd2acaa7SJan Engelhardt bool "Hybla" if TCP_CONG_HYBLA=y 598dd2acaa7SJan Engelhardt 5993d2573f7SStephen Hemminger config DEFAULT_VEGAS 6003d2573f7SStephen Hemminger bool "Vegas" if TCP_CONG_VEGAS=y 6013d2573f7SStephen Hemminger 6026ce1a6dfSJan Engelhardt config DEFAULT_VENO 6036ce1a6dfSJan Engelhardt bool "Veno" if TCP_CONG_VENO=y 6046ce1a6dfSJan Engelhardt 6053d2573f7SStephen Hemminger config DEFAULT_WESTWOOD 6063d2573f7SStephen Hemminger bool "Westwood" if TCP_CONG_WESTWOOD=y 6073d2573f7SStephen Hemminger 6083d2573f7SStephen Hemminger config DEFAULT_RENO 6093d2573f7SStephen Hemminger bool "Reno" 6103d2573f7SStephen Hemminger 6113d2573f7SStephen Hemmingerendchoice 6123d2573f7SStephen Hemminger 6133d2573f7SStephen Hemmingerendif 61483803034SStephen Hemminger 615597811ecSStephen Hemmingerconfig TCP_CONG_CUBIC 6166c360767SDavid S. Miller tristate 617a6484045SDavid S. Miller depends on !TCP_CONG_ADVANCED 618a6484045SDavid S. Miller default y 619a6484045SDavid S. Miller 6203d2573f7SStephen Hemmingerconfig DEFAULT_TCP_CONG 6213d2573f7SStephen Hemminger string 6223d2573f7SStephen Hemminger default "bic" if DEFAULT_BIC 6233d2573f7SStephen Hemminger default "cubic" if DEFAULT_CUBIC 6243d2573f7SStephen Hemminger default "htcp" if DEFAULT_HTCP 625dd2acaa7SJan Engelhardt default "hybla" if DEFAULT_HYBLA 6263d2573f7SStephen Hemminger default "vegas" if DEFAULT_VEGAS 6273d2573f7SStephen Hemminger default "westwood" if DEFAULT_WESTWOOD 6286ce1a6dfSJan Engelhardt default "veno" if DEFAULT_VENO 6293d2573f7SStephen Hemminger default "reno" if DEFAULT_RENO 630597811ecSStephen Hemminger default "cubic" 6313d2573f7SStephen Hemminger 632cfb6eeb4SYOSHIFUJI Hideakiconfig TCP_MD5SIG 63344fbe920SKees Cook bool "TCP: MD5 Signature Option support (RFC2385)" 634cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO 635cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO_MD5 636cfb6eeb4SYOSHIFUJI Hideaki ---help--- 6373dde6ad8SDavid Sterba RFC2385 specifies a method of giving MD5 protection to TCP sessions. 638cfb6eeb4SYOSHIFUJI Hideaki Its main (only?) use is to protect BGP sessions between core routers 639cfb6eeb4SYOSHIFUJI Hideaki on the Internet. 640cfb6eeb4SYOSHIFUJI Hideaki 641cfb6eeb4SYOSHIFUJI Hideaki If unsure, say N. 642