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 381da177e4SLinus Torvalds If you turn on IP forwarding, you will also get 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 491da177e4SLinus Torvalds or 50d7394372SDave Jones echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds If unsure, say N here. 531da177e4SLinus Torvalds 54bb298ca3SDavid S. Millerchoice 55bb298ca3SDavid S. Miller prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)" 56bb298ca3SDavid S. Miller depends on IP_ADVANCED_ROUTER 576876f95fSAdrian Bunk default ASK_IP_FIB_HASH 58bb298ca3SDavid S. Miller 596876f95fSAdrian Bunkconfig ASK_IP_FIB_HASH 60bb298ca3SDavid S. Miller bool "FIB_HASH" 61bb298ca3SDavid S. Miller ---help--- 62bb298ca3SDavid S. Miller Current FIB is very proven and good enough for most users. 63bb298ca3SDavid S. Miller 64bb298ca3SDavid S. Millerconfig IP_FIB_TRIE 65bb298ca3SDavid S. Miller bool "FIB_TRIE" 66bb298ca3SDavid S. Miller ---help--- 6744c09201SMatt LaPlante Use new experimental LC-trie as FIB lookup algorithm. 68bb298ca3SDavid S. Miller This improves lookup performance if you have a large 69bb298ca3SDavid S. Miller number of routes. 70bb298ca3SDavid S. Miller 71bb298ca3SDavid S. Miller LC-trie is a longest matching prefix lookup algorithm which 72bb298ca3SDavid S. Miller performs better than FIB_HASH for large routing tables. 73bb298ca3SDavid S. Miller But, it consumes more memory and is more complex. 74bb298ca3SDavid S. Miller 75bb298ca3SDavid S. Miller LC-trie is described in: 76bb298ca3SDavid S. Miller 77bb298ca3SDavid S. Miller IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson 78bb298ca3SDavid S. Miller IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999 79bb298ca3SDavid S. Miller An experimental study of compression methods for dynamic tries 80bb298ca3SDavid S. Miller Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002. 81bb298ca3SDavid S. Miller http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/ 82bb298ca3SDavid S. Miller 83bb298ca3SDavid S. Millerendchoice 84bb298ca3SDavid S. Miller 85bb298ca3SDavid S. Millerconfig IP_FIB_HASH 866876f95fSAdrian Bunk def_bool ASK_IP_FIB_HASH || !IP_ADVANCED_ROUTER 87bb298ca3SDavid S. Miller 8866a2f7fdSStephen Hemmingerconfig IP_FIB_TRIE_STATS 8966a2f7fdSStephen Hemminger bool "FIB TRIE statistics" 9066a2f7fdSStephen Hemminger depends on IP_FIB_TRIE 9166a2f7fdSStephen Hemminger ---help--- 9266a2f7fdSStephen Hemminger Keep track of statistics on structure of FIB TRIE table. 9366a2f7fdSStephen Hemminger Useful for testing and measuring TRIE performance. 9466a2f7fdSStephen Hemminger 951da177e4SLinus Torvaldsconfig IP_MULTIPLE_TABLES 961da177e4SLinus Torvalds bool "IP: policy routing" 971da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 98e1ef4bf2SThomas Graf select FIB_RULES 991da177e4SLinus Torvalds ---help--- 1001da177e4SLinus Torvalds Normally, a router decides what to do with a received packet based 1011da177e4SLinus Torvalds solely on the packet's final destination address. If you say Y here, 1021da177e4SLinus Torvalds the Linux router will also be able to take the packet's source 1031da177e4SLinus Torvalds address into account. Furthermore, the TOS (Type-Of-Service) field 1041da177e4SLinus Torvalds of the packet can be used for routing decisions as well. 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds If you are interested in this, please see the preliminary 1071da177e4SLinus Torvalds documentation at <http://www.compendium.com.ar/policy-routing.txt> 1081da177e4SLinus Torvalds and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>. 1091da177e4SLinus Torvalds You will need supporting software from 1101da177e4SLinus Torvalds <ftp://ftp.tux.org/pub/net/ip-routing/>. 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds If unsure, say N. 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvaldsconfig IP_ROUTE_MULTIPATH 1151da177e4SLinus Torvalds bool "IP: equal cost multipath" 1161da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 1171da177e4SLinus Torvalds help 1181da177e4SLinus Torvalds Normally, the routing tables specify a single action to be taken in 1191da177e4SLinus Torvalds a deterministic manner for a given packet. If you say Y here 1201da177e4SLinus Torvalds however, it becomes possible to attach several actions to a packet 1211da177e4SLinus Torvalds pattern, in effect specifying several alternative paths to travel 1221da177e4SLinus Torvalds for those packets. The router considers all these paths to be of 1231da177e4SLinus Torvalds equal "cost" and chooses one of them in a non-deterministic fashion 1241da177e4SLinus Torvalds if a matching packet arrives. 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvaldsconfig IP_ROUTE_VERBOSE 1271da177e4SLinus Torvalds bool "IP: verbose route monitoring" 1281da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 1291da177e4SLinus Torvalds help 1301da177e4SLinus Torvalds If you say Y here, which is recommended, then the kernel will print 1311da177e4SLinus Torvalds verbose messages regarding the routing, for example warnings about 1321da177e4SLinus Torvalds received packets which look strange and could be evidence of an 1331da177e4SLinus Torvalds attack or a misconfigured system somewhere. The information is 1341da177e4SLinus Torvalds handled by the klogd daemon which is responsible for kernel messages 1351da177e4SLinus Torvalds ("man klogd"). 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvaldsconfig IP_PNP 1381da177e4SLinus Torvalds bool "IP: kernel level autoconfiguration" 1391da177e4SLinus Torvalds help 1401da177e4SLinus Torvalds This enables automatic configuration of IP addresses of devices and 1411da177e4SLinus Torvalds of the routing table during kernel boot, based on either information 1421da177e4SLinus Torvalds supplied on the kernel command line or by BOOTP or RARP protocols. 1431da177e4SLinus Torvalds You need to say Y only for diskless machines requiring network 1441da177e4SLinus Torvalds access to boot (in which case you want to say Y to "Root file system 1451da177e4SLinus Torvalds on NFS" as well), because all other machines configure the network 1461da177e4SLinus Torvalds in their startup scripts. 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvaldsconfig IP_PNP_DHCP 1491da177e4SLinus Torvalds bool "IP: DHCP support" 1501da177e4SLinus Torvalds depends on IP_PNP 1511da177e4SLinus Torvalds ---help--- 1521da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1531da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1541da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1551da177e4SLinus Torvalds discovered automatically at boot time using the DHCP protocol (a 1561da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1571da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1581da177e4SLinus Torvalds does DHCP itself, providing all necessary information on the kernel 1591da177e4SLinus Torvalds command line, you can say N here. 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds If unsure, say Y. Note that if you want to use DHCP, a DHCP server 1621da177e4SLinus Torvalds must be operating on your network. Read 1636ded55daSJ. Bruce Fields <file:Documentation/filesystems/nfsroot.txt> for details. 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvaldsconfig IP_PNP_BOOTP 1661da177e4SLinus Torvalds bool "IP: BOOTP support" 1671da177e4SLinus Torvalds depends on IP_PNP 1681da177e4SLinus Torvalds ---help--- 1691da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1701da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1711da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1721da177e4SLinus Torvalds discovered automatically at boot time using the BOOTP protocol (a 1731da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1741da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1751da177e4SLinus Torvalds does BOOTP itself, providing all necessary information on the kernel 1761da177e4SLinus Torvalds command line, you can say N here. If unsure, say Y. Note that if you 1771da177e4SLinus Torvalds want to use BOOTP, a BOOTP server must be operating on your network. 1786ded55daSJ. Bruce Fields Read <file:Documentation/filesystems/nfsroot.txt> for details. 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvaldsconfig IP_PNP_RARP 1811da177e4SLinus Torvalds bool "IP: RARP support" 1821da177e4SLinus Torvalds depends on IP_PNP 1831da177e4SLinus Torvalds help 1841da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1851da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1861da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1871da177e4SLinus Torvalds discovered automatically at boot time using the RARP protocol (an 1881da177e4SLinus Torvalds older protocol which is being obsoleted by BOOTP and DHCP), say Y 1891da177e4SLinus Torvalds here. Note that if you want to use RARP, a RARP server must be 1906ded55daSJ. Bruce Fields operating on your network. Read 1916ded55daSJ. Bruce Fields <file:Documentation/filesystems/nfsroot.txt> for details. 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds# not yet ready.. 1941da177e4SLinus Torvalds# bool ' IP: ARP support' CONFIG_IP_PNP_ARP 1951da177e4SLinus Torvaldsconfig NET_IPIP 1961da177e4SLinus Torvalds tristate "IP: tunneling" 197d2acc347SHerbert Xu select INET_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 encapsulation of IP within IP, which sounds kind of pointless, but 2031da177e4SLinus Torvalds can be useful if you want to make your (or some other) machine 2041da177e4SLinus Torvalds appear on a different network than it physically is, or to use 2051da177e4SLinus Torvalds mobile-IP facilities (allowing laptops to seamlessly move between 2061da177e4SLinus Torvalds networks without changing their IP addresses). 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds Saying Y to this option will produce two modules ( = code which can 2091da177e4SLinus Torvalds be inserted in and removed from the running kernel whenever you 2101da177e4SLinus Torvalds want). Most people won't need this and can say N. 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvaldsconfig NET_IPGRE 2131da177e4SLinus Torvalds tristate "IP: GRE tunnels over IP" 2141da177e4SLinus Torvalds help 2151da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 2161da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 2171da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 2181da177e4SLinus Torvalds GRE (Generic Routing Encapsulation) and at this time allows 2191da177e4SLinus Torvalds encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. 2201da177e4SLinus Torvalds This driver is useful if the other endpoint is a Cisco router: Cisco 2211da177e4SLinus Torvalds likes GRE much better than the other Linux tunneling driver ("IP 2221da177e4SLinus Torvalds tunneling" above). In addition, GRE allows multicast redistribution 2231da177e4SLinus Torvalds through the tunnel. 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvaldsconfig NET_IPGRE_BROADCAST 2261da177e4SLinus Torvalds bool "IP: broadcast GRE over IP" 2271da177e4SLinus Torvalds depends on IP_MULTICAST && NET_IPGRE 2281da177e4SLinus Torvalds help 2291da177e4SLinus Torvalds One application of GRE/IP is to construct a broadcast WAN (Wide Area 2301da177e4SLinus Torvalds Network), which looks like a normal Ethernet LAN (Local Area 2311da177e4SLinus Torvalds Network), but can be distributed all over the Internet. If you want 2321da177e4SLinus Torvalds to do that, say Y here and to "IP multicast routing" below. 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvaldsconfig IP_MROUTE 2351da177e4SLinus Torvalds bool "IP: multicast routing" 2361da177e4SLinus Torvalds depends on IP_MULTICAST 2371da177e4SLinus Torvalds help 2381da177e4SLinus Torvalds This is used if you want your machine to act as a router for IP 2391da177e4SLinus Torvalds packets that have several destination addresses. It is needed on the 2401da177e4SLinus Torvalds MBONE, a high bandwidth network on top of the Internet which carries 2411da177e4SLinus Torvalds audio and video broadcasts. In order to do that, you would most 2421da177e4SLinus Torvalds likely run the program mrouted. Information about the multicast 2431da177e4SLinus Torvalds capabilities of the various network cards is contained in 2441da177e4SLinus Torvalds <file:Documentation/networking/multicast.txt>. If you haven't heard 2451da177e4SLinus Torvalds about it, you don't need it. 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvaldsconfig IP_PIMSM_V1 2481da177e4SLinus Torvalds bool "IP: PIM-SM version 1 support" 2491da177e4SLinus Torvalds depends on IP_MROUTE 2501da177e4SLinus Torvalds help 2511da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM (Protocol Independent 2521da177e4SLinus Torvalds Multicast) version 1. This multicast routing protocol is used widely 2531da177e4SLinus Torvalds because Cisco supports it. You need special software to use it 2541da177e4SLinus Torvalds (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more 2551da177e4SLinus Torvalds information about PIM. 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds Say Y if you want to use PIM-SM v1. Note that you can say N here if 2581da177e4SLinus Torvalds you just want to use Dense Mode PIM. 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvaldsconfig IP_PIMSM_V2 2611da177e4SLinus Torvalds bool "IP: PIM-SM version 2 support" 2621da177e4SLinus Torvalds depends on IP_MROUTE 2631da177e4SLinus Torvalds help 2641da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM version 2. In order to use 2651da177e4SLinus Torvalds this, you need an experimental routing daemon supporting it (pimd or 2661da177e4SLinus Torvalds gated-5). This routing protocol is not used widely, so say N unless 2671da177e4SLinus Torvalds you want to play with it. 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvaldsconfig ARPD 2701da177e4SLinus Torvalds bool "IP: ARP daemon support (EXPERIMENTAL)" 2716a2e9b73SSam Ravnborg depends on EXPERIMENTAL 2721da177e4SLinus Torvalds ---help--- 2731da177e4SLinus Torvalds Normally, the kernel maintains an internal cache which maps IP 2741da177e4SLinus Torvalds addresses to hardware addresses on the local network, so that 2751da177e4SLinus Torvalds Ethernet/Token Ring/ etc. frames are sent to the proper address on 2761da177e4SLinus Torvalds the physical networking layer. For small networks having a few 2771da177e4SLinus Torvalds hundred directly connected hosts or less, keeping this address 2781da177e4SLinus Torvalds resolution (ARP) cache inside the kernel works well. However, 2791da177e4SLinus Torvalds maintaining an internal ARP cache does not work well for very large 2801da177e4SLinus Torvalds switched networks, and will use a lot of kernel memory if TCP/IP 2811da177e4SLinus Torvalds connections are made to many machines on the network. 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds If you say Y here, the kernel's internal ARP cache will never grow 2841da177e4SLinus Torvalds to more than 256 entries (the oldest entries are expired in a LIFO 2851da177e4SLinus Torvalds manner) and communication will be attempted with the user space ARP 2861da177e4SLinus Torvalds daemon arpd. Arpd then answers the address resolution request either 2871da177e4SLinus Torvalds from its own cache or by asking the net. 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds This code is experimental and also obsolete. If you want to use it, 2901da177e4SLinus Torvalds you need to find a version of the daemon arpd on the net somewhere, 2911da177e4SLinus Torvalds and you should also say Y to "Kernel/User network link driver", 2921da177e4SLinus Torvalds below. If unsure, say N. 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvaldsconfig SYN_COOKIES 2951da177e4SLinus Torvalds bool "IP: TCP syncookie support (disabled per default)" 2961da177e4SLinus Torvalds ---help--- 2971da177e4SLinus Torvalds Normal TCP/IP networking is open to an attack known as "SYN 2981da177e4SLinus Torvalds flooding". This denial-of-service attack prevents legitimate remote 2991da177e4SLinus Torvalds users from being able to connect to your computer during an ongoing 3001da177e4SLinus Torvalds attack and requires very little work from the attacker, who can 3011da177e4SLinus Torvalds operate from anywhere on the Internet. 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds SYN cookies provide protection against this type of attack. If you 3041da177e4SLinus Torvalds say Y here, the TCP/IP stack will use a cryptographic challenge 3051da177e4SLinus Torvalds protocol known as "SYN cookies" to enable legitimate users to 3061da177e4SLinus Torvalds continue to connect, even when your machine is under attack. There 3071da177e4SLinus Torvalds is no need for the legitimate users to change their TCP/IP software; 3081da177e4SLinus Torvalds SYN cookies work transparently to them. For technical information 3091da177e4SLinus Torvalds about SYN cookies, check out <http://cr.yp.to/syncookies.html>. 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds If you are SYN flooded, the source address reported by the kernel is 3121da177e4SLinus Torvalds likely to have been forged by the attacker; it is only reported as 3131da177e4SLinus Torvalds an aid in tracing the packets to their actual source and should not 3141da177e4SLinus Torvalds be taken as absolute truth. 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds SYN cookies may prevent correct error reporting on clients when the 3171da177e4SLinus Torvalds server is really overloaded. If this happens frequently better turn 3181da177e4SLinus Torvalds them off. 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds If you say Y here, note that SYN cookies aren't enabled by default; 3211da177e4SLinus Torvalds you can enable them by saying Y to "/proc file system support" and 3221da177e4SLinus Torvalds "Sysctl support" below and executing the command 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds echo 1 >/proc/sys/net/ipv4/tcp_syncookies 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds at boot time after the /proc file system has been mounted. 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds If unsure, say N. 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvaldsconfig INET_AH 3311da177e4SLinus Torvalds tristate "IP: AH transformation" 3321da177e4SLinus Torvalds select XFRM 3331da177e4SLinus Torvalds select CRYPTO 3341da177e4SLinus Torvalds select CRYPTO_HMAC 3351da177e4SLinus Torvalds select CRYPTO_MD5 3361da177e4SLinus Torvalds select CRYPTO_SHA1 3371da177e4SLinus Torvalds ---help--- 3381da177e4SLinus Torvalds Support for IPsec AH. 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds If unsure, say Y. 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvaldsconfig INET_ESP 3431da177e4SLinus Torvalds tristate "IP: ESP transformation" 3441da177e4SLinus Torvalds select XFRM 3451da177e4SLinus Torvalds select CRYPTO 346ed58dd41SHerbert Xu select CRYPTO_AUTHENC 3471da177e4SLinus Torvalds select CRYPTO_HMAC 3481da177e4SLinus Torvalds select CRYPTO_MD5 3496b7326c8SHerbert Xu select CRYPTO_CBC 3501da177e4SLinus Torvalds select CRYPTO_SHA1 3511da177e4SLinus Torvalds select CRYPTO_DES 3521da177e4SLinus Torvalds ---help--- 3531da177e4SLinus Torvalds Support for IPsec ESP. 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds If unsure, say Y. 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvaldsconfig INET_IPCOMP 3581da177e4SLinus Torvalds tristate "IP: IPComp transformation" 359d2acc347SHerbert Xu select INET_XFRM_TUNNEL 3606fccab67SHerbert Xu select XFRM_IPCOMP 3611da177e4SLinus Torvalds ---help--- 3621da177e4SLinus Torvalds Support for IP Payload Compression Protocol (IPComp) (RFC3173), 3631da177e4SLinus Torvalds typically needed for IPsec. 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds If unsure, say Y. 3661da177e4SLinus Torvalds 367d2acc347SHerbert Xuconfig INET_XFRM_TUNNEL 368d2acc347SHerbert Xu tristate 369d2acc347SHerbert Xu select INET_TUNNEL 370d2acc347SHerbert Xu default n 3711da177e4SLinus Torvalds 372d2acc347SHerbert Xuconfig INET_TUNNEL 373d2acc347SHerbert Xu tristate 374d2acc347SHerbert Xu default n 3751da177e4SLinus Torvalds 376b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TRANSPORT 377b59f45d0SHerbert Xu tristate "IP: IPsec transport mode" 378b59f45d0SHerbert Xu default y 379b59f45d0SHerbert Xu select XFRM 380b59f45d0SHerbert Xu ---help--- 381b59f45d0SHerbert Xu Support for IPsec transport mode. 382b59f45d0SHerbert Xu 383b59f45d0SHerbert Xu If unsure, say Y. 384b59f45d0SHerbert Xu 385b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TUNNEL 386b59f45d0SHerbert Xu tristate "IP: IPsec tunnel mode" 387b59f45d0SHerbert Xu default y 388b59f45d0SHerbert Xu select XFRM 389b59f45d0SHerbert Xu ---help--- 390b59f45d0SHerbert Xu Support for IPsec tunnel mode. 391b59f45d0SHerbert Xu 392b59f45d0SHerbert Xu If unsure, say Y. 393b59f45d0SHerbert Xu 3940a69452cSDiego Beltramiconfig INET_XFRM_MODE_BEET 3950a69452cSDiego Beltrami tristate "IP: IPsec BEET mode" 3960a69452cSDiego Beltrami default y 3970a69452cSDiego Beltrami select XFRM 3980a69452cSDiego Beltrami ---help--- 3990a69452cSDiego Beltrami Support for IPsec BEET mode. 4000a69452cSDiego Beltrami 4010a69452cSDiego Beltrami If unsure, say Y. 4020a69452cSDiego Beltrami 40371c87e0cSJan-Bernd Themannconfig INET_LRO 40471c87e0cSJan-Bernd Themann tristate "Large Receive Offload (ipv4/tcp)" 40571c87e0cSJan-Bernd Themann 40671c87e0cSJan-Bernd Themann ---help--- 40771c87e0cSJan-Bernd Themann Support for Large Receive Offload (ipv4/tcp). 40871c87e0cSJan-Bernd Themann 40971c87e0cSJan-Bernd Themann If unsure, say Y. 41071c87e0cSJan-Bernd Themann 41117b085eaSArnaldo Carvalho de Meloconfig INET_DIAG 41217b085eaSArnaldo Carvalho de Melo tristate "INET: socket monitoring interface" 4131da177e4SLinus Torvalds default y 4141da177e4SLinus Torvalds ---help--- 41573c1f4a0SArnaldo Carvalho de Melo Support for INET (TCP, DCCP, etc) socket monitoring interface used by 41673c1f4a0SArnaldo Carvalho de Melo native Linux tools such as ss. ss is included in iproute2, currently 417f4b9479dSBaruch Even downloadable at <http://linux-net.osdl.org/index.php/Iproute2>. 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds If unsure, say Y. 4201da177e4SLinus Torvalds 42117b085eaSArnaldo Carvalho de Meloconfig INET_TCP_DIAG 42217b085eaSArnaldo Carvalho de Melo depends on INET_DIAG 42317b085eaSArnaldo Carvalho de Melo def_tristate INET_DIAG 42417b085eaSArnaldo Carvalho de Melo 4253d2573f7SStephen Hemmingermenuconfig TCP_CONG_ADVANCED 426a6484045SDavid S. Miller bool "TCP: advanced congestion control" 427a6484045SDavid S. Miller ---help--- 428a6484045SDavid S. Miller Support for selection of various TCP congestion control 429a6484045SDavid S. Miller modules. 430a6484045SDavid S. Miller 431a6484045SDavid S. Miller Nearly all users can safely say no here, and a safe default 432597811ecSStephen Hemminger selection will be made (CUBIC with new Reno as a fallback). 433a6484045SDavid S. Miller 434a6484045SDavid S. Miller If unsure, say N. 435a6484045SDavid S. Miller 4363d2573f7SStephen Hemmingerif TCP_CONG_ADVANCED 43783803034SStephen Hemminger 43883803034SStephen Hemmingerconfig TCP_CONG_BIC 43983803034SStephen Hemminger tristate "Binary Increase Congestion (BIC) control" 440597811ecSStephen Hemminger default m 44183803034SStephen Hemminger ---help--- 44283803034SStephen Hemminger BIC-TCP is a sender-side only change that ensures a linear RTT 44383803034SStephen Hemminger fairness under large windows while offering both scalability and 44483803034SStephen Hemminger bounded TCP-friendliness. The protocol combines two schemes 44583803034SStephen Hemminger called additive increase and binary search increase. When the 44683803034SStephen Hemminger congestion window is large, additive increase with a large 44783803034SStephen Hemminger increment ensures linear RTT fairness as well as good 44883803034SStephen Hemminger scalability. Under small congestion windows, binary search 44983803034SStephen Hemminger increase provides TCP friendliness. 45083803034SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/ 45183803034SStephen Hemminger 452df3271f3SStephen Hemmingerconfig TCP_CONG_CUBIC 453df3271f3SStephen Hemminger tristate "CUBIC TCP" 454597811ecSStephen Hemminger default y 455df3271f3SStephen Hemminger ---help--- 456df3271f3SStephen Hemminger This is version 2.0 of BIC-TCP which uses a cubic growth function 457df3271f3SStephen Hemminger among other techniques. 458df3271f3SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf 459df3271f3SStephen Hemminger 46087270762SStephen Hemmingerconfig TCP_CONG_WESTWOOD 46187270762SStephen Hemminger tristate "TCP Westwood+" 46287270762SStephen Hemminger default m 46387270762SStephen Hemminger ---help--- 46487270762SStephen Hemminger TCP Westwood+ is a sender-side only modification of the TCP Reno 46587270762SStephen Hemminger protocol stack that optimizes the performance of TCP congestion 46687270762SStephen Hemminger control. It is based on end-to-end bandwidth estimation to set 46787270762SStephen Hemminger congestion window and slow start threshold after a congestion 46887270762SStephen Hemminger episode. Using this estimation, TCP Westwood+ adaptively sets a 46987270762SStephen Hemminger slow start threshold and a congestion window which takes into 47087270762SStephen Hemminger account the bandwidth used at the time congestion is experienced. 47187270762SStephen Hemminger TCP Westwood+ significantly increases fairness wrt TCP Reno in 47287270762SStephen Hemminger wired networks and throughput over wireless links. 47387270762SStephen Hemminger 474a7868ea6SBaruch Evenconfig TCP_CONG_HTCP 475a7868ea6SBaruch Even tristate "H-TCP" 476a7868ea6SBaruch Even default m 477a7868ea6SBaruch Even ---help--- 478a7868ea6SBaruch Even H-TCP is a send-side only modifications of the TCP Reno 479a7868ea6SBaruch Even protocol stack that optimizes the performance of TCP 480a7868ea6SBaruch Even congestion control for high speed network links. It uses a 481a7868ea6SBaruch Even modeswitch to change the alpha and beta parameters of TCP Reno 482a7868ea6SBaruch Even based on network conditions and in a way so as to be fair with 483a7868ea6SBaruch Even other Reno and H-TCP flows. 484a7868ea6SBaruch Even 485a628d29bSJohn Heffnerconfig TCP_CONG_HSTCP 486a628d29bSJohn Heffner tristate "High Speed TCP" 4876a2e9b73SSam Ravnborg depends on EXPERIMENTAL 488a628d29bSJohn Heffner default n 489a628d29bSJohn Heffner ---help--- 490a628d29bSJohn Heffner Sally Floyd's High Speed TCP (RFC 3649) congestion control. 491a628d29bSJohn Heffner A modification to TCP's congestion control mechanism for use 492a628d29bSJohn Heffner with large congestion windows. A table indicates how much to 493a628d29bSJohn Heffner increase the congestion window by when an ACK is received. 494a628d29bSJohn Heffner For more detail see http://www.icir.org/floyd/hstcp.html 495a628d29bSJohn Heffner 496835b3f0cSDaniele Lacameraconfig TCP_CONG_HYBLA 497835b3f0cSDaniele Lacamera tristate "TCP-Hybla congestion control algorithm" 4986a2e9b73SSam Ravnborg depends on EXPERIMENTAL 499835b3f0cSDaniele Lacamera default n 500835b3f0cSDaniele Lacamera ---help--- 501835b3f0cSDaniele Lacamera TCP-Hybla is a sender-side only change that eliminates penalization of 502835b3f0cSDaniele Lacamera long-RTT, large-bandwidth connections, like when satellite legs are 50344c09201SMatt LaPlante involved, especially when sharing a common bottleneck with normal 504835b3f0cSDaniele Lacamera terrestrial connections. 505835b3f0cSDaniele Lacamera 506b87d8561SStephen Hemmingerconfig TCP_CONG_VEGAS 507b87d8561SStephen Hemminger tristate "TCP Vegas" 5086a2e9b73SSam Ravnborg depends on EXPERIMENTAL 509b87d8561SStephen Hemminger default n 510b87d8561SStephen Hemminger ---help--- 511b87d8561SStephen Hemminger TCP Vegas is a sender-side only change to TCP that anticipates 512b87d8561SStephen Hemminger the onset of congestion by estimating the bandwidth. TCP Vegas 513b87d8561SStephen Hemminger adjusts the sending rate by modifying the congestion 514b87d8561SStephen Hemminger window. TCP Vegas should provide less packet loss, but it is 515b87d8561SStephen Hemminger not as aggressive as TCP Reno. 516b87d8561SStephen Hemminger 5170e57976bSJohn Heffnerconfig TCP_CONG_SCALABLE 5180e57976bSJohn Heffner tristate "Scalable TCP" 5196a2e9b73SSam Ravnborg depends on EXPERIMENTAL 5200e57976bSJohn Heffner default n 5210e57976bSJohn Heffner ---help--- 5220e57976bSJohn Heffner Scalable TCP is a sender-side only change to TCP which uses a 5230e57976bSJohn Heffner MIMD congestion control algorithm which has some nice scaling 5240e57976bSJohn Heffner properties, though is known to have fairness issues. 525f4b9479dSBaruch Even See http://www.deneholme.net/tom/scalable/ 526a7868ea6SBaruch Even 5277c106d7eSWong Hoi Sing Edisonconfig TCP_CONG_LP 5287c106d7eSWong Hoi Sing Edison tristate "TCP Low Priority" 5297c106d7eSWong Hoi Sing Edison depends on EXPERIMENTAL 5307c106d7eSWong Hoi Sing Edison default n 5317c106d7eSWong Hoi Sing Edison ---help--- 5327c106d7eSWong Hoi Sing Edison TCP Low Priority (TCP-LP), a distributed algorithm whose goal is 533cab00891SMatt LaPlante to utilize only the excess network bandwidth as compared to the 5347c106d7eSWong Hoi Sing Edison ``fair share`` of bandwidth as targeted by TCP. 5357c106d7eSWong Hoi Sing Edison See http://www-ece.rice.edu/networks/TCP-LP/ 5367c106d7eSWong Hoi Sing Edison 53776f10177SBin Zhouconfig TCP_CONG_VENO 53876f10177SBin Zhou tristate "TCP Veno" 53976f10177SBin Zhou depends on EXPERIMENTAL 54076f10177SBin Zhou default n 54176f10177SBin Zhou ---help--- 54276f10177SBin Zhou TCP Veno is a sender-side only enhancement of TCP to obtain better 54376f10177SBin Zhou throughput over wireless networks. TCP Veno makes use of state 54476f10177SBin Zhou distinguishing to circumvent the difficult judgment of the packet loss 54576f10177SBin Zhou type. TCP Veno cuts down less congestion window in response to random 54676f10177SBin Zhou loss packets. 54776f10177SBin Zhou See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf 54876f10177SBin Zhou 5495ef81475SAngelo P. Castellaniconfig TCP_CONG_YEAH 5505ef81475SAngelo P. Castellani tristate "YeAH TCP" 5515ef81475SAngelo P. Castellani depends on EXPERIMENTAL 5522ff011efSDavid S. Miller select TCP_CONG_VEGAS 5535ef81475SAngelo P. Castellani default n 5545ef81475SAngelo P. Castellani ---help--- 5555ef81475SAngelo P. Castellani YeAH-TCP is a sender-side high-speed enabled TCP congestion control 5565ef81475SAngelo P. Castellani algorithm, which uses a mixed loss/delay approach to compute the 5575ef81475SAngelo P. Castellani congestion window. It's design goals target high efficiency, 5585ef81475SAngelo P. Castellani internal, RTT and Reno fairness, resilience to link loss while 5595ef81475SAngelo P. Castellani keeping network elements load as low as possible. 5605ef81475SAngelo P. Castellani 5615ef81475SAngelo P. Castellani For further details look here: 5625ef81475SAngelo P. Castellani http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf 5635ef81475SAngelo P. Castellani 564c462238dSStephen Hemmingerconfig TCP_CONG_ILLINOIS 565c462238dSStephen Hemminger tristate "TCP Illinois" 566c462238dSStephen Hemminger depends on EXPERIMENTAL 567c462238dSStephen Hemminger default n 568c462238dSStephen Hemminger ---help--- 56901dd2fbfSMatt LaPlante TCP-Illinois is a sender-side modification of TCP Reno for 570c462238dSStephen Hemminger high speed long delay links. It uses round-trip-time to 571c462238dSStephen Hemminger adjust the alpha and beta parameters to achieve a higher average 572c462238dSStephen Hemminger throughput and maintain fairness. 573c462238dSStephen Hemminger 574c462238dSStephen Hemminger For further details see: 575c462238dSStephen Hemminger http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html 576c462238dSStephen Hemminger 5773d2573f7SStephen Hemmingerchoice 5783d2573f7SStephen Hemminger prompt "Default TCP congestion control" 579597811ecSStephen Hemminger default DEFAULT_CUBIC 5803d2573f7SStephen Hemminger help 5813d2573f7SStephen Hemminger Select the TCP congestion control that will be used by default 5823d2573f7SStephen Hemminger for all connections. 5833d2573f7SStephen Hemminger 5843d2573f7SStephen Hemminger config DEFAULT_BIC 5853d2573f7SStephen Hemminger bool "Bic" if TCP_CONG_BIC=y 5863d2573f7SStephen Hemminger 5873d2573f7SStephen Hemminger config DEFAULT_CUBIC 5883d2573f7SStephen Hemminger bool "Cubic" if TCP_CONG_CUBIC=y 5893d2573f7SStephen Hemminger 5903d2573f7SStephen Hemminger config DEFAULT_HTCP 5913d2573f7SStephen Hemminger bool "Htcp" if TCP_CONG_HTCP=y 5923d2573f7SStephen Hemminger 5933d2573f7SStephen Hemminger config DEFAULT_VEGAS 5943d2573f7SStephen Hemminger bool "Vegas" if TCP_CONG_VEGAS=y 5953d2573f7SStephen Hemminger 5963d2573f7SStephen Hemminger config DEFAULT_WESTWOOD 5973d2573f7SStephen Hemminger bool "Westwood" if TCP_CONG_WESTWOOD=y 5983d2573f7SStephen Hemminger 5993d2573f7SStephen Hemminger config DEFAULT_RENO 6003d2573f7SStephen Hemminger bool "Reno" 6013d2573f7SStephen Hemminger 6023d2573f7SStephen Hemmingerendchoice 6033d2573f7SStephen Hemminger 6043d2573f7SStephen Hemmingerendif 60583803034SStephen Hemminger 606597811ecSStephen Hemmingerconfig TCP_CONG_CUBIC 6076c360767SDavid S. Miller tristate 608a6484045SDavid S. Miller depends on !TCP_CONG_ADVANCED 609a6484045SDavid S. Miller default y 610a6484045SDavid S. Miller 6113d2573f7SStephen Hemmingerconfig DEFAULT_TCP_CONG 6123d2573f7SStephen Hemminger string 6133d2573f7SStephen Hemminger default "bic" if DEFAULT_BIC 6143d2573f7SStephen Hemminger default "cubic" if DEFAULT_CUBIC 6153d2573f7SStephen Hemminger default "htcp" if DEFAULT_HTCP 6163d2573f7SStephen Hemminger default "vegas" if DEFAULT_VEGAS 6173d2573f7SStephen Hemminger default "westwood" if DEFAULT_WESTWOOD 6183d2573f7SStephen Hemminger default "reno" if DEFAULT_RENO 619597811ecSStephen Hemminger default "cubic" 6203d2573f7SStephen Hemminger 621cfb6eeb4SYOSHIFUJI Hideakiconfig TCP_MD5SIG 622cfb6eeb4SYOSHIFUJI Hideaki bool "TCP: MD5 Signature Option support (RFC2385) (EXPERIMENTAL)" 623cfb6eeb4SYOSHIFUJI Hideaki depends on EXPERIMENTAL 624cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO 625cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO_MD5 626cfb6eeb4SYOSHIFUJI Hideaki ---help--- 6273dde6ad8SDavid Sterba RFC2385 specifies a method of giving MD5 protection to TCP sessions. 628cfb6eeb4SYOSHIFUJI Hideaki Its main (only?) use is to protect BGP sessions between core routers 629cfb6eeb4SYOSHIFUJI Hideaki on the Internet. 630cfb6eeb4SYOSHIFUJI Hideaki 631cfb6eeb4SYOSHIFUJI Hideaki If unsure, say N. 632cfb6eeb4SYOSHIFUJI Hideaki 6331da177e4SLinus Torvaldssource "net/ipv4/ipvs/Kconfig" 6341da177e4SLinus Torvalds 635