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 49b2cc46a8SJesper Dangaard Brouer and 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 58bb298ca3SDavid S. Millerchoice 59bb298ca3SDavid S. Miller prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)" 60bb298ca3SDavid S. Miller depends on IP_ADVANCED_ROUTER 616876f95fSAdrian Bunk default ASK_IP_FIB_HASH 62bb298ca3SDavid S. Miller 636876f95fSAdrian Bunkconfig ASK_IP_FIB_HASH 64bb298ca3SDavid S. Miller bool "FIB_HASH" 65bb298ca3SDavid S. Miller ---help--- 66bb298ca3SDavid S. Miller Current FIB is very proven and good enough for most users. 67bb298ca3SDavid S. Miller 68bb298ca3SDavid S. Millerconfig IP_FIB_TRIE 69bb298ca3SDavid S. Miller bool "FIB_TRIE" 70bb298ca3SDavid S. Miller ---help--- 7144c09201SMatt LaPlante Use new experimental LC-trie as FIB lookup algorithm. 72bb298ca3SDavid S. Miller This improves lookup performance if you have a large 73bb298ca3SDavid S. Miller number of routes. 74bb298ca3SDavid S. Miller 75bb298ca3SDavid S. Miller LC-trie is a longest matching prefix lookup algorithm which 76bb298ca3SDavid S. Miller performs better than FIB_HASH for large routing tables. 77bb298ca3SDavid S. Miller But, it consumes more memory and is more complex. 78bb298ca3SDavid S. Miller 79bb298ca3SDavid S. Miller LC-trie is described in: 80bb298ca3SDavid S. Miller 81bb298ca3SDavid S. Miller IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson 82a6e8f27fSJesper Dangaard Brouer IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, 83a6e8f27fSJesper Dangaard Brouer June 1999 84a6e8f27fSJesper Dangaard Brouer 85bb298ca3SDavid S. Miller An experimental study of compression methods for dynamic tries 86bb298ca3SDavid S. Miller Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002. 87bb298ca3SDavid S. Miller http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/ 88bb298ca3SDavid S. Miller 89bb298ca3SDavid S. Millerendchoice 90bb298ca3SDavid S. Miller 91bb298ca3SDavid S. Millerconfig IP_FIB_HASH 926876f95fSAdrian Bunk def_bool ASK_IP_FIB_HASH || !IP_ADVANCED_ROUTER 93bb298ca3SDavid S. Miller 9466a2f7fdSStephen Hemmingerconfig IP_FIB_TRIE_STATS 9566a2f7fdSStephen Hemminger bool "FIB TRIE statistics" 9666a2f7fdSStephen Hemminger depends on IP_FIB_TRIE 9766a2f7fdSStephen Hemminger ---help--- 9866a2f7fdSStephen Hemminger Keep track of statistics on structure of FIB TRIE table. 9966a2f7fdSStephen Hemminger Useful for testing and measuring TRIE performance. 10066a2f7fdSStephen Hemminger 1011da177e4SLinus Torvaldsconfig IP_MULTIPLE_TABLES 1021da177e4SLinus Torvalds bool "IP: policy routing" 1031da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 104e1ef4bf2SThomas Graf select FIB_RULES 1051da177e4SLinus Torvalds ---help--- 1061da177e4SLinus Torvalds Normally, a router decides what to do with a received packet based 1071da177e4SLinus Torvalds solely on the packet's final destination address. If you say Y here, 1081da177e4SLinus Torvalds the Linux router will also be able to take the packet's source 1091da177e4SLinus Torvalds address into account. Furthermore, the TOS (Type-Of-Service) field 1101da177e4SLinus Torvalds of the packet can be used for routing decisions as well. 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds If you are interested in this, please see the preliminary 1131da177e4SLinus Torvalds documentation at <http://www.compendium.com.ar/policy-routing.txt> 1141da177e4SLinus Torvalds and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>. 1151da177e4SLinus Torvalds You will need supporting software from 1161da177e4SLinus Torvalds <ftp://ftp.tux.org/pub/net/ip-routing/>. 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds If unsure, say N. 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvaldsconfig IP_ROUTE_MULTIPATH 1211da177e4SLinus Torvalds bool "IP: equal cost multipath" 1221da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 1231da177e4SLinus Torvalds help 1241da177e4SLinus Torvalds Normally, the routing tables specify a single action to be taken in 1251da177e4SLinus Torvalds a deterministic manner for a given packet. If you say Y here 1261da177e4SLinus Torvalds however, it becomes possible to attach several actions to a packet 1271da177e4SLinus Torvalds pattern, in effect specifying several alternative paths to travel 1281da177e4SLinus Torvalds for those packets. The router considers all these paths to be of 1291da177e4SLinus Torvalds equal "cost" and chooses one of them in a non-deterministic fashion 1301da177e4SLinus Torvalds if a matching packet arrives. 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvaldsconfig IP_ROUTE_VERBOSE 1331da177e4SLinus Torvalds bool "IP: verbose route monitoring" 1341da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 1351da177e4SLinus Torvalds help 1361da177e4SLinus Torvalds If you say Y here, which is recommended, then the kernel will print 1371da177e4SLinus Torvalds verbose messages regarding the routing, for example warnings about 1381da177e4SLinus Torvalds received packets which look strange and could be evidence of an 1391da177e4SLinus Torvalds attack or a misconfigured system somewhere. The information is 1401da177e4SLinus Torvalds handled by the klogd daemon which is responsible for kernel messages 1411da177e4SLinus Torvalds ("man klogd"). 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvaldsconfig IP_PNP 1441da177e4SLinus Torvalds bool "IP: kernel level autoconfiguration" 1451da177e4SLinus Torvalds help 1461da177e4SLinus Torvalds This enables automatic configuration of IP addresses of devices and 1471da177e4SLinus Torvalds of the routing table during kernel boot, based on either information 1481da177e4SLinus Torvalds supplied on the kernel command line or by BOOTP or RARP protocols. 1491da177e4SLinus Torvalds You need to say Y only for diskless machines requiring network 1501da177e4SLinus Torvalds access to boot (in which case you want to say Y to "Root file system 1511da177e4SLinus Torvalds on NFS" as well), because all other machines configure the network 1521da177e4SLinus Torvalds in their startup scripts. 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvaldsconfig IP_PNP_DHCP 1551da177e4SLinus Torvalds bool "IP: DHCP support" 1561da177e4SLinus Torvalds depends on IP_PNP 1571da177e4SLinus Torvalds ---help--- 1581da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1591da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1601da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1611da177e4SLinus Torvalds discovered automatically at boot time using the DHCP protocol (a 1621da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1631da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1641da177e4SLinus Torvalds does DHCP itself, providing all necessary information on the kernel 1651da177e4SLinus Torvalds command line, you can say N here. 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds If unsure, say Y. Note that if you want to use DHCP, a DHCP server 1681da177e4SLinus Torvalds must be operating on your network. Read 169dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvaldsconfig IP_PNP_BOOTP 1721da177e4SLinus Torvalds bool "IP: BOOTP support" 1731da177e4SLinus Torvalds depends on IP_PNP 1741da177e4SLinus Torvalds ---help--- 1751da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1761da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1771da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1781da177e4SLinus Torvalds discovered automatically at boot time using the BOOTP protocol (a 1791da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1801da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1811da177e4SLinus Torvalds does BOOTP itself, providing all necessary information on the kernel 1821da177e4SLinus Torvalds command line, you can say N here. If unsure, say Y. Note that if you 1831da177e4SLinus Torvalds want to use BOOTP, a BOOTP server must be operating on your network. 184dc7a0816SJ. Bruce Fields Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvaldsconfig IP_PNP_RARP 1871da177e4SLinus Torvalds bool "IP: RARP support" 1881da177e4SLinus Torvalds depends on IP_PNP 1891da177e4SLinus Torvalds help 1901da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1911da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1921da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1931da177e4SLinus Torvalds discovered automatically at boot time using the RARP protocol (an 1941da177e4SLinus Torvalds older protocol which is being obsoleted by BOOTP and DHCP), say Y 1951da177e4SLinus Torvalds here. Note that if you want to use RARP, a RARP server must be 1966ded55daSJ. Bruce Fields operating on your network. Read 197dc7a0816SJ. Bruce Fields <file:Documentation/filesystems/nfs/nfsroot.txt> for details. 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds# not yet ready.. 2001da177e4SLinus Torvalds# bool ' IP: ARP support' CONFIG_IP_PNP_ARP 2011da177e4SLinus Torvaldsconfig NET_IPIP 2021da177e4SLinus Torvalds tristate "IP: tunneling" 203d2acc347SHerbert Xu select INET_TUNNEL 2041da177e4SLinus Torvalds ---help--- 2051da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 2061da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 2071da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 2081da177e4SLinus Torvalds encapsulation of IP within IP, which sounds kind of pointless, but 2091da177e4SLinus Torvalds can be useful if you want to make your (or some other) machine 2101da177e4SLinus Torvalds appear on a different network than it physically is, or to use 2111da177e4SLinus Torvalds mobile-IP facilities (allowing laptops to seamlessly move between 2121da177e4SLinus Torvalds networks without changing their IP addresses). 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds Saying Y to this option will produce two modules ( = code which can 2151da177e4SLinus Torvalds be inserted in and removed from the running kernel whenever you 2161da177e4SLinus Torvalds want). Most people won't need this and can say N. 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvaldsconfig NET_IPGRE 2191da177e4SLinus Torvalds tristate "IP: GRE tunnels over IP" 2201da177e4SLinus Torvalds help 2211da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 2221da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 2231da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 2241da177e4SLinus Torvalds GRE (Generic Routing Encapsulation) and at this time allows 2251da177e4SLinus Torvalds encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. 2261da177e4SLinus Torvalds This driver is useful if the other endpoint is a Cisco router: Cisco 2271da177e4SLinus Torvalds likes GRE much better than the other Linux tunneling driver ("IP 2281da177e4SLinus Torvalds tunneling" above). In addition, GRE allows multicast redistribution 2291da177e4SLinus Torvalds through the tunnel. 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvaldsconfig NET_IPGRE_BROADCAST 2321da177e4SLinus Torvalds bool "IP: broadcast GRE over IP" 2331da177e4SLinus Torvalds depends on IP_MULTICAST && NET_IPGRE 2341da177e4SLinus Torvalds help 2351da177e4SLinus Torvalds One application of GRE/IP is to construct a broadcast WAN (Wide Area 2361da177e4SLinus Torvalds Network), which looks like a normal Ethernet LAN (Local Area 2371da177e4SLinus Torvalds Network), but can be distributed all over the Internet. If you want 2381da177e4SLinus Torvalds to do that, say Y here and to "IP multicast routing" below. 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvaldsconfig IP_MROUTE 2411da177e4SLinus Torvalds bool "IP: multicast routing" 2421da177e4SLinus Torvalds depends on IP_MULTICAST 2431da177e4SLinus Torvalds help 2441da177e4SLinus Torvalds This is used if you want your machine to act as a router for IP 2451da177e4SLinus Torvalds packets that have several destination addresses. It is needed on the 2461da177e4SLinus Torvalds MBONE, a high bandwidth network on top of the Internet which carries 2471da177e4SLinus Torvalds audio and video broadcasts. In order to do that, you would most 2481da177e4SLinus Torvalds likely run the program mrouted. Information about the multicast 2491da177e4SLinus Torvalds capabilities of the various network cards is contained in 2501da177e4SLinus Torvalds <file:Documentation/networking/multicast.txt>. If you haven't heard 2511da177e4SLinus Torvalds about it, you don't need it. 2521da177e4SLinus Torvalds 253f0ad0860SPatrick McHardyconfig IP_MROUTE_MULTIPLE_TABLES 254f0ad0860SPatrick McHardy bool "IP: multicast policy routing" 25566496d49SPatrick McHardy depends on IP_MROUTE && IP_ADVANCED_ROUTER 256f0ad0860SPatrick McHardy select FIB_RULES 257f0ad0860SPatrick McHardy help 258f0ad0860SPatrick McHardy Normally, a multicast router runs a userspace daemon and decides 259f0ad0860SPatrick McHardy what to do with a multicast packet based on the source and 260f0ad0860SPatrick McHardy destination addresses. If you say Y here, the multicast router 261f0ad0860SPatrick McHardy will also be able to take interfaces and packet marks into 262f0ad0860SPatrick McHardy account and run multiple instances of userspace daemons 263f0ad0860SPatrick McHardy simultaneously, each one handling a single table. 264f0ad0860SPatrick McHardy 265f0ad0860SPatrick McHardy If unsure, say N. 266f0ad0860SPatrick McHardy 2671da177e4SLinus Torvaldsconfig IP_PIMSM_V1 2681da177e4SLinus Torvalds bool "IP: PIM-SM version 1 support" 2691da177e4SLinus Torvalds depends on IP_MROUTE 2701da177e4SLinus Torvalds help 2711da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM (Protocol Independent 2721da177e4SLinus Torvalds Multicast) version 1. This multicast routing protocol is used widely 2731da177e4SLinus Torvalds because Cisco supports it. You need special software to use it 2741da177e4SLinus Torvalds (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more 2751da177e4SLinus Torvalds information about PIM. 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds Say Y if you want to use PIM-SM v1. Note that you can say N here if 2781da177e4SLinus Torvalds you just want to use Dense Mode PIM. 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvaldsconfig IP_PIMSM_V2 2811da177e4SLinus Torvalds bool "IP: PIM-SM version 2 support" 2821da177e4SLinus Torvalds depends on IP_MROUTE 2831da177e4SLinus Torvalds help 2841da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM version 2. In order to use 2851da177e4SLinus Torvalds this, you need an experimental routing daemon supporting it (pimd or 2861da177e4SLinus Torvalds gated-5). This routing protocol is not used widely, so say N unless 2871da177e4SLinus Torvalds you want to play with it. 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvaldsconfig ARPD 290e61a4b63STimo Teräs bool "IP: ARP daemon support" 2911da177e4SLinus Torvalds ---help--- 292e61a4b63STimo Teräs The kernel maintains an internal cache which maps IP addresses to 293e61a4b63STimo Teräs hardware addresses on the local network, so that Ethernet/Token Ring/ 294e61a4b63STimo Teräs etc. frames are sent to the proper address on the physical networking 295e61a4b63STimo Teräs layer. Normally, kernel uses the ARP protocol to resolve these 296e61a4b63STimo Teräs mappings. 2971da177e4SLinus Torvalds 298e61a4b63STimo Teräs Saying Y here adds support to have an user space daemon to do this 299e61a4b63STimo Teräs resolution instead. This is useful for implementing an alternate 300e61a4b63STimo Teräs address resolution protocol (e.g. NHRP on mGRE tunnels) and also for 301e61a4b63STimo Teräs testing purposes. 3021da177e4SLinus Torvalds 303e61a4b63STimo Teräs If unsure, say N. 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvaldsconfig SYN_COOKIES 3061da177e4SLinus Torvalds bool "IP: TCP syncookie support (disabled per default)" 3071da177e4SLinus Torvalds ---help--- 3081da177e4SLinus Torvalds Normal TCP/IP networking is open to an attack known as "SYN 3091da177e4SLinus Torvalds flooding". This denial-of-service attack prevents legitimate remote 3101da177e4SLinus Torvalds users from being able to connect to your computer during an ongoing 3111da177e4SLinus Torvalds attack and requires very little work from the attacker, who can 3121da177e4SLinus Torvalds operate from anywhere on the Internet. 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds SYN cookies provide protection against this type of attack. If you 3151da177e4SLinus Torvalds say Y here, the TCP/IP stack will use a cryptographic challenge 3161da177e4SLinus Torvalds protocol known as "SYN cookies" to enable legitimate users to 3171da177e4SLinus Torvalds continue to connect, even when your machine is under attack. There 3181da177e4SLinus Torvalds is no need for the legitimate users to change their TCP/IP software; 3191da177e4SLinus Torvalds SYN cookies work transparently to them. For technical information 3201da177e4SLinus Torvalds about SYN cookies, check out <http://cr.yp.to/syncookies.html>. 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds If you are SYN flooded, the source address reported by the kernel is 3231da177e4SLinus Torvalds likely to have been forged by the attacker; it is only reported as 3241da177e4SLinus Torvalds an aid in tracing the packets to their actual source and should not 3251da177e4SLinus Torvalds be taken as absolute truth. 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds SYN cookies may prevent correct error reporting on clients when the 3281da177e4SLinus Torvalds server is really overloaded. If this happens frequently better turn 3291da177e4SLinus Torvalds them off. 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds If you say Y here, note that SYN cookies aren't enabled by default; 3321da177e4SLinus Torvalds you can enable them by saying Y to "/proc file system support" and 3331da177e4SLinus Torvalds "Sysctl support" below and executing the command 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds echo 1 >/proc/sys/net/ipv4/tcp_syncookies 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds at boot time after the /proc file system has been mounted. 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds If unsure, say N. 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvaldsconfig INET_AH 3421da177e4SLinus Torvalds tristate "IP: AH transformation" 3431da177e4SLinus Torvalds select XFRM 3441da177e4SLinus Torvalds select CRYPTO 3451da177e4SLinus Torvalds select CRYPTO_HMAC 3461da177e4SLinus Torvalds select CRYPTO_MD5 3471da177e4SLinus Torvalds select CRYPTO_SHA1 3481da177e4SLinus Torvalds ---help--- 3491da177e4SLinus Torvalds Support for IPsec AH. 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds If unsure, say Y. 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvaldsconfig INET_ESP 3541da177e4SLinus Torvalds tristate "IP: ESP transformation" 3551da177e4SLinus Torvalds select XFRM 3561da177e4SLinus Torvalds select CRYPTO 357ed58dd41SHerbert Xu select CRYPTO_AUTHENC 3581da177e4SLinus Torvalds select CRYPTO_HMAC 3591da177e4SLinus Torvalds select CRYPTO_MD5 3606b7326c8SHerbert Xu select CRYPTO_CBC 3611da177e4SLinus Torvalds select CRYPTO_SHA1 3621da177e4SLinus Torvalds select CRYPTO_DES 3631da177e4SLinus Torvalds ---help--- 3641da177e4SLinus Torvalds Support for IPsec ESP. 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds If unsure, say Y. 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvaldsconfig INET_IPCOMP 3691da177e4SLinus Torvalds tristate "IP: IPComp transformation" 370d2acc347SHerbert Xu select INET_XFRM_TUNNEL 3716fccab67SHerbert Xu select XFRM_IPCOMP 3721da177e4SLinus Torvalds ---help--- 3731da177e4SLinus Torvalds Support for IP Payload Compression Protocol (IPComp) (RFC3173), 3741da177e4SLinus Torvalds typically needed for IPsec. 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds If unsure, say Y. 3771da177e4SLinus Torvalds 378d2acc347SHerbert Xuconfig INET_XFRM_TUNNEL 379d2acc347SHerbert Xu tristate 380d2acc347SHerbert Xu select INET_TUNNEL 381d2acc347SHerbert Xu default n 3821da177e4SLinus Torvalds 383d2acc347SHerbert Xuconfig INET_TUNNEL 384d2acc347SHerbert Xu tristate 385d2acc347SHerbert Xu default n 3861da177e4SLinus Torvalds 387b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TRANSPORT 388b59f45d0SHerbert Xu tristate "IP: IPsec transport mode" 389b59f45d0SHerbert Xu default y 390b59f45d0SHerbert Xu select XFRM 391b59f45d0SHerbert Xu ---help--- 392b59f45d0SHerbert Xu Support for IPsec transport mode. 393b59f45d0SHerbert Xu 394b59f45d0SHerbert Xu If unsure, say Y. 395b59f45d0SHerbert Xu 396b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TUNNEL 397b59f45d0SHerbert Xu tristate "IP: IPsec tunnel mode" 398b59f45d0SHerbert Xu default y 399b59f45d0SHerbert Xu select XFRM 400b59f45d0SHerbert Xu ---help--- 401b59f45d0SHerbert Xu Support for IPsec tunnel mode. 402b59f45d0SHerbert Xu 403b59f45d0SHerbert Xu If unsure, say Y. 404b59f45d0SHerbert Xu 4050a69452cSDiego Beltramiconfig INET_XFRM_MODE_BEET 4060a69452cSDiego Beltrami tristate "IP: IPsec BEET mode" 4070a69452cSDiego Beltrami default y 4080a69452cSDiego Beltrami select XFRM 4090a69452cSDiego Beltrami ---help--- 4100a69452cSDiego Beltrami Support for IPsec BEET mode. 4110a69452cSDiego Beltrami 4120a69452cSDiego Beltrami If unsure, say Y. 4130a69452cSDiego Beltrami 41471c87e0cSJan-Bernd Themannconfig INET_LRO 415e81963b1SDavid S. Miller bool "Large Receive Offload (ipv4/tcp)" 416bc8a5397SFrans Pop default y 41771c87e0cSJan-Bernd Themann ---help--- 41871c87e0cSJan-Bernd Themann Support for Large Receive Offload (ipv4/tcp). 41971c87e0cSJan-Bernd Themann 42071c87e0cSJan-Bernd Themann If unsure, say Y. 42171c87e0cSJan-Bernd Themann 42217b085eaSArnaldo Carvalho de Meloconfig INET_DIAG 42317b085eaSArnaldo Carvalho de Melo tristate "INET: socket monitoring interface" 4241da177e4SLinus Torvalds default y 4251da177e4SLinus Torvalds ---help--- 42673c1f4a0SArnaldo Carvalho de Melo Support for INET (TCP, DCCP, etc) socket monitoring interface used by 42773c1f4a0SArnaldo Carvalho de Melo native Linux tools such as ss. ss is included in iproute2, currently 428f4b9479dSBaruch Even downloadable at <http://linux-net.osdl.org/index.php/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 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" 4986a2e9b73SSam Ravnborg depends on EXPERIMENTAL 499a628d29bSJohn Heffner default n 500a628d29bSJohn Heffner ---help--- 501a628d29bSJohn Heffner Sally Floyd's High Speed TCP (RFC 3649) congestion control. 502a628d29bSJohn Heffner A modification to TCP's congestion control mechanism for use 503a628d29bSJohn Heffner with large congestion windows. A table indicates how much to 504a628d29bSJohn Heffner increase the congestion window by when an ACK is received. 505a628d29bSJohn Heffner For more detail see http://www.icir.org/floyd/hstcp.html 506a628d29bSJohn Heffner 507835b3f0cSDaniele Lacameraconfig TCP_CONG_HYBLA 508835b3f0cSDaniele Lacamera tristate "TCP-Hybla congestion control algorithm" 5096a2e9b73SSam Ravnborg depends on EXPERIMENTAL 510835b3f0cSDaniele Lacamera default n 511835b3f0cSDaniele Lacamera ---help--- 512835b3f0cSDaniele Lacamera TCP-Hybla is a sender-side only change that eliminates penalization of 513835b3f0cSDaniele Lacamera long-RTT, large-bandwidth connections, like when satellite legs are 51444c09201SMatt LaPlante involved, especially when sharing a common bottleneck with normal 515835b3f0cSDaniele Lacamera terrestrial connections. 516835b3f0cSDaniele Lacamera 517b87d8561SStephen Hemmingerconfig TCP_CONG_VEGAS 518b87d8561SStephen Hemminger tristate "TCP Vegas" 5196a2e9b73SSam Ravnborg depends on EXPERIMENTAL 520b87d8561SStephen Hemminger default n 521b87d8561SStephen Hemminger ---help--- 522b87d8561SStephen Hemminger TCP Vegas is a sender-side only change to TCP that anticipates 523b87d8561SStephen Hemminger the onset of congestion by estimating the bandwidth. TCP Vegas 524b87d8561SStephen Hemminger adjusts the sending rate by modifying the congestion 525b87d8561SStephen Hemminger window. TCP Vegas should provide less packet loss, but it is 526b87d8561SStephen Hemminger not as aggressive as TCP Reno. 527b87d8561SStephen Hemminger 5280e57976bSJohn Heffnerconfig TCP_CONG_SCALABLE 5290e57976bSJohn Heffner tristate "Scalable TCP" 5306a2e9b73SSam Ravnborg depends on EXPERIMENTAL 5310e57976bSJohn Heffner default n 5320e57976bSJohn Heffner ---help--- 5330e57976bSJohn Heffner Scalable TCP is a sender-side only change to TCP which uses a 5340e57976bSJohn Heffner MIMD congestion control algorithm which has some nice scaling 5350e57976bSJohn Heffner properties, though is known to have fairness issues. 536f4b9479dSBaruch Even See http://www.deneholme.net/tom/scalable/ 537a7868ea6SBaruch Even 5387c106d7eSWong Hoi Sing Edisonconfig TCP_CONG_LP 5397c106d7eSWong Hoi Sing Edison tristate "TCP Low Priority" 5407c106d7eSWong Hoi Sing Edison depends on EXPERIMENTAL 5417c106d7eSWong Hoi Sing Edison default n 5427c106d7eSWong Hoi Sing Edison ---help--- 5437c106d7eSWong Hoi Sing Edison TCP Low Priority (TCP-LP), a distributed algorithm whose goal is 544cab00891SMatt LaPlante to utilize only the excess network bandwidth as compared to the 5457c106d7eSWong Hoi Sing Edison ``fair share`` of bandwidth as targeted by TCP. 5467c106d7eSWong Hoi Sing Edison See http://www-ece.rice.edu/networks/TCP-LP/ 5477c106d7eSWong Hoi Sing Edison 54876f10177SBin Zhouconfig TCP_CONG_VENO 54976f10177SBin Zhou tristate "TCP Veno" 55076f10177SBin Zhou depends on EXPERIMENTAL 55176f10177SBin Zhou default n 55276f10177SBin Zhou ---help--- 55376f10177SBin Zhou TCP Veno is a sender-side only enhancement of TCP to obtain better 55476f10177SBin Zhou throughput over wireless networks. TCP Veno makes use of state 55576f10177SBin Zhou distinguishing to circumvent the difficult judgment of the packet loss 55676f10177SBin Zhou type. TCP Veno cuts down less congestion window in response to random 55776f10177SBin Zhou loss packets. 55876f10177SBin Zhou See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf 55976f10177SBin Zhou 5605ef81475SAngelo P. Castellaniconfig TCP_CONG_YEAH 5615ef81475SAngelo P. Castellani tristate "YeAH TCP" 5625ef81475SAngelo P. Castellani depends on EXPERIMENTAL 5632ff011efSDavid S. Miller select TCP_CONG_VEGAS 5645ef81475SAngelo P. Castellani default n 5655ef81475SAngelo P. Castellani ---help--- 5665ef81475SAngelo P. Castellani YeAH-TCP is a sender-side high-speed enabled TCP congestion control 5675ef81475SAngelo P. Castellani algorithm, which uses a mixed loss/delay approach to compute the 5685ef81475SAngelo P. Castellani congestion window. It's design goals target high efficiency, 5695ef81475SAngelo P. Castellani internal, RTT and Reno fairness, resilience to link loss while 5705ef81475SAngelo P. Castellani keeping network elements load as low as possible. 5715ef81475SAngelo P. Castellani 5725ef81475SAngelo P. Castellani For further details look here: 5735ef81475SAngelo P. Castellani http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf 5745ef81475SAngelo P. Castellani 575c462238dSStephen Hemmingerconfig TCP_CONG_ILLINOIS 576c462238dSStephen Hemminger tristate "TCP Illinois" 577c462238dSStephen Hemminger depends on EXPERIMENTAL 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 5883d2573f7SStephen Hemmingerchoice 5893d2573f7SStephen Hemminger prompt "Default TCP congestion control" 590597811ecSStephen Hemminger default DEFAULT_CUBIC 5913d2573f7SStephen Hemminger help 5923d2573f7SStephen Hemminger Select the TCP congestion control that will be used by default 5933d2573f7SStephen Hemminger for all connections. 5943d2573f7SStephen Hemminger 5953d2573f7SStephen Hemminger config DEFAULT_BIC 5963d2573f7SStephen Hemminger bool "Bic" if TCP_CONG_BIC=y 5973d2573f7SStephen Hemminger 5983d2573f7SStephen Hemminger config DEFAULT_CUBIC 5993d2573f7SStephen Hemminger bool "Cubic" if TCP_CONG_CUBIC=y 6003d2573f7SStephen Hemminger 6013d2573f7SStephen Hemminger config DEFAULT_HTCP 6023d2573f7SStephen Hemminger bool "Htcp" if TCP_CONG_HTCP=y 6033d2573f7SStephen Hemminger 604dd2acaa7SJan Engelhardt config DEFAULT_HYBLA 605dd2acaa7SJan Engelhardt bool "Hybla" if TCP_CONG_HYBLA=y 606dd2acaa7SJan Engelhardt 6073d2573f7SStephen Hemminger config DEFAULT_VEGAS 6083d2573f7SStephen Hemminger bool "Vegas" if TCP_CONG_VEGAS=y 6093d2573f7SStephen Hemminger 6106ce1a6dfSJan Engelhardt config DEFAULT_VENO 6116ce1a6dfSJan Engelhardt bool "Veno" if TCP_CONG_VENO=y 6126ce1a6dfSJan Engelhardt 6133d2573f7SStephen Hemminger config DEFAULT_WESTWOOD 6143d2573f7SStephen Hemminger bool "Westwood" if TCP_CONG_WESTWOOD=y 6153d2573f7SStephen Hemminger 6163d2573f7SStephen Hemminger config DEFAULT_RENO 6173d2573f7SStephen Hemminger bool "Reno" 6183d2573f7SStephen Hemminger 6193d2573f7SStephen Hemmingerendchoice 6203d2573f7SStephen Hemminger 6213d2573f7SStephen Hemmingerendif 62283803034SStephen Hemminger 623597811ecSStephen Hemmingerconfig TCP_CONG_CUBIC 6246c360767SDavid S. Miller tristate 625a6484045SDavid S. Miller depends on !TCP_CONG_ADVANCED 626a6484045SDavid S. Miller default y 627a6484045SDavid S. Miller 6283d2573f7SStephen Hemmingerconfig DEFAULT_TCP_CONG 6293d2573f7SStephen Hemminger string 6303d2573f7SStephen Hemminger default "bic" if DEFAULT_BIC 6313d2573f7SStephen Hemminger default "cubic" if DEFAULT_CUBIC 6323d2573f7SStephen Hemminger default "htcp" if DEFAULT_HTCP 633dd2acaa7SJan Engelhardt default "hybla" if DEFAULT_HYBLA 6343d2573f7SStephen Hemminger default "vegas" if DEFAULT_VEGAS 6353d2573f7SStephen Hemminger default "westwood" if DEFAULT_WESTWOOD 6366ce1a6dfSJan Engelhardt default "veno" if DEFAULT_VENO 6373d2573f7SStephen Hemminger default "reno" if DEFAULT_RENO 638597811ecSStephen Hemminger default "cubic" 6393d2573f7SStephen Hemminger 640cfb6eeb4SYOSHIFUJI Hideakiconfig TCP_MD5SIG 641cfb6eeb4SYOSHIFUJI Hideaki bool "TCP: MD5 Signature Option support (RFC2385) (EXPERIMENTAL)" 642cfb6eeb4SYOSHIFUJI Hideaki depends on EXPERIMENTAL 643cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO 644cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO_MD5 645cfb6eeb4SYOSHIFUJI Hideaki ---help--- 6463dde6ad8SDavid Sterba RFC2385 specifies a method of giving MD5 protection to TCP sessions. 647cfb6eeb4SYOSHIFUJI Hideaki Its main (only?) use is to protect BGP sessions between core routers 648cfb6eeb4SYOSHIFUJI Hideaki on the Internet. 649cfb6eeb4SYOSHIFUJI Hideaki 650cfb6eeb4SYOSHIFUJI Hideaki If unsure, say N. 651cfb6eeb4SYOSHIFUJI Hideaki 652