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. 53b2cc46a8SJesper Dangaard Brouer 541da177e4SLinus Torvalds If unsure, say N here. 551da177e4SLinus Torvalds 56bb298ca3SDavid S. Millerchoice 57bb298ca3SDavid S. Miller prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)" 58bb298ca3SDavid S. Miller depends on IP_ADVANCED_ROUTER 596876f95fSAdrian Bunk default ASK_IP_FIB_HASH 60bb298ca3SDavid S. Miller 616876f95fSAdrian Bunkconfig ASK_IP_FIB_HASH 62bb298ca3SDavid S. Miller bool "FIB_HASH" 63bb298ca3SDavid S. Miller ---help--- 64bb298ca3SDavid S. Miller Current FIB is very proven and good enough for most users. 65bb298ca3SDavid S. Miller 66bb298ca3SDavid S. Millerconfig IP_FIB_TRIE 67bb298ca3SDavid S. Miller bool "FIB_TRIE" 68bb298ca3SDavid S. Miller ---help--- 6944c09201SMatt LaPlante Use new experimental LC-trie as FIB lookup algorithm. 70bb298ca3SDavid S. Miller This improves lookup performance if you have a large 71bb298ca3SDavid S. Miller number of routes. 72bb298ca3SDavid S. Miller 73bb298ca3SDavid S. Miller LC-trie is a longest matching prefix lookup algorithm which 74bb298ca3SDavid S. Miller performs better than FIB_HASH for large routing tables. 75bb298ca3SDavid S. Miller But, it consumes more memory and is more complex. 76bb298ca3SDavid S. Miller 77bb298ca3SDavid S. Miller LC-trie is described in: 78bb298ca3SDavid S. Miller 79bb298ca3SDavid S. Miller IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson 80a6e8f27fSJesper Dangaard Brouer IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, 81a6e8f27fSJesper Dangaard Brouer June 1999 82a6e8f27fSJesper Dangaard Brouer 83bb298ca3SDavid S. Miller An experimental study of compression methods for dynamic tries 84bb298ca3SDavid S. Miller Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002. 85bb298ca3SDavid S. Miller http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/ 86bb298ca3SDavid S. Miller 87bb298ca3SDavid S. Millerendchoice 88bb298ca3SDavid S. Miller 89bb298ca3SDavid S. Millerconfig IP_FIB_HASH 906876f95fSAdrian Bunk def_bool ASK_IP_FIB_HASH || !IP_ADVANCED_ROUTER 91bb298ca3SDavid S. Miller 9266a2f7fdSStephen Hemmingerconfig IP_FIB_TRIE_STATS 9366a2f7fdSStephen Hemminger bool "FIB TRIE statistics" 9466a2f7fdSStephen Hemminger depends on IP_FIB_TRIE 9566a2f7fdSStephen Hemminger ---help--- 9666a2f7fdSStephen Hemminger Keep track of statistics on structure of FIB TRIE table. 9766a2f7fdSStephen Hemminger Useful for testing and measuring TRIE performance. 9866a2f7fdSStephen Hemminger 991da177e4SLinus Torvaldsconfig IP_MULTIPLE_TABLES 1001da177e4SLinus Torvalds bool "IP: policy routing" 1011da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 102e1ef4bf2SThomas Graf select FIB_RULES 1031da177e4SLinus Torvalds ---help--- 1041da177e4SLinus Torvalds Normally, a router decides what to do with a received packet based 1051da177e4SLinus Torvalds solely on the packet's final destination address. If you say Y here, 1061da177e4SLinus Torvalds the Linux router will also be able to take the packet's source 1071da177e4SLinus Torvalds address into account. Furthermore, the TOS (Type-Of-Service) field 1081da177e4SLinus Torvalds of the packet can be used for routing decisions as well. 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds If you are interested in this, please see the preliminary 1111da177e4SLinus Torvalds documentation at <http://www.compendium.com.ar/policy-routing.txt> 1121da177e4SLinus Torvalds and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>. 1131da177e4SLinus Torvalds You will need supporting software from 1141da177e4SLinus Torvalds <ftp://ftp.tux.org/pub/net/ip-routing/>. 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds If unsure, say N. 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvaldsconfig IP_ROUTE_MULTIPATH 1191da177e4SLinus Torvalds bool "IP: equal cost multipath" 1201da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 1211da177e4SLinus Torvalds help 1221da177e4SLinus Torvalds Normally, the routing tables specify a single action to be taken in 1231da177e4SLinus Torvalds a deterministic manner for a given packet. If you say Y here 1241da177e4SLinus Torvalds however, it becomes possible to attach several actions to a packet 1251da177e4SLinus Torvalds pattern, in effect specifying several alternative paths to travel 1261da177e4SLinus Torvalds for those packets. The router considers all these paths to be of 1271da177e4SLinus Torvalds equal "cost" and chooses one of them in a non-deterministic fashion 1281da177e4SLinus Torvalds if a matching packet arrives. 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvaldsconfig IP_ROUTE_VERBOSE 1311da177e4SLinus Torvalds bool "IP: verbose route monitoring" 1321da177e4SLinus Torvalds depends on IP_ADVANCED_ROUTER 1331da177e4SLinus Torvalds help 1341da177e4SLinus Torvalds If you say Y here, which is recommended, then the kernel will print 1351da177e4SLinus Torvalds verbose messages regarding the routing, for example warnings about 1361da177e4SLinus Torvalds received packets which look strange and could be evidence of an 1371da177e4SLinus Torvalds attack or a misconfigured system somewhere. The information is 1381da177e4SLinus Torvalds handled by the klogd daemon which is responsible for kernel messages 1391da177e4SLinus Torvalds ("man klogd"). 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvaldsconfig IP_PNP 1421da177e4SLinus Torvalds bool "IP: kernel level autoconfiguration" 1431da177e4SLinus Torvalds help 1441da177e4SLinus Torvalds This enables automatic configuration of IP addresses of devices and 1451da177e4SLinus Torvalds of the routing table during kernel boot, based on either information 1461da177e4SLinus Torvalds supplied on the kernel command line or by BOOTP or RARP protocols. 1471da177e4SLinus Torvalds You need to say Y only for diskless machines requiring network 1481da177e4SLinus Torvalds access to boot (in which case you want to say Y to "Root file system 1491da177e4SLinus Torvalds on NFS" as well), because all other machines configure the network 1501da177e4SLinus Torvalds in their startup scripts. 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvaldsconfig IP_PNP_DHCP 1531da177e4SLinus Torvalds bool "IP: DHCP support" 1541da177e4SLinus Torvalds depends on IP_PNP 1551da177e4SLinus Torvalds ---help--- 1561da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1571da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1581da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1591da177e4SLinus Torvalds discovered automatically at boot time using the DHCP protocol (a 1601da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1611da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1621da177e4SLinus Torvalds does DHCP itself, providing all necessary information on the kernel 1631da177e4SLinus Torvalds command line, you can say N here. 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds If unsure, say Y. Note that if you want to use DHCP, a DHCP server 1661da177e4SLinus Torvalds must be operating on your network. Read 1676ded55daSJ. Bruce Fields <file:Documentation/filesystems/nfsroot.txt> for details. 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvaldsconfig IP_PNP_BOOTP 1701da177e4SLinus Torvalds bool "IP: BOOTP support" 1711da177e4SLinus Torvalds depends on IP_PNP 1721da177e4SLinus Torvalds ---help--- 1731da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1741da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1751da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1761da177e4SLinus Torvalds discovered automatically at boot time using the BOOTP protocol (a 1771da177e4SLinus Torvalds special protocol designed for doing this job), say Y here. In case 1781da177e4SLinus Torvalds the boot ROM of your network card was designed for booting Linux and 1791da177e4SLinus Torvalds does BOOTP itself, providing all necessary information on the kernel 1801da177e4SLinus Torvalds command line, you can say N here. If unsure, say Y. Note that if you 1811da177e4SLinus Torvalds want to use BOOTP, a BOOTP server must be operating on your network. 1826ded55daSJ. Bruce Fields Read <file:Documentation/filesystems/nfsroot.txt> for details. 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvaldsconfig IP_PNP_RARP 1851da177e4SLinus Torvalds bool "IP: RARP support" 1861da177e4SLinus Torvalds depends on IP_PNP 1871da177e4SLinus Torvalds help 1881da177e4SLinus Torvalds If you want your Linux box to mount its whole root file system (the 1891da177e4SLinus Torvalds one containing the directory /) from some other computer over the 1901da177e4SLinus Torvalds net via NFS and you want the IP address of your computer to be 1911da177e4SLinus Torvalds discovered automatically at boot time using the RARP protocol (an 1921da177e4SLinus Torvalds older protocol which is being obsoleted by BOOTP and DHCP), say Y 1931da177e4SLinus Torvalds here. Note that if you want to use RARP, a RARP server must be 1946ded55daSJ. Bruce Fields operating on your network. Read 1956ded55daSJ. Bruce Fields <file:Documentation/filesystems/nfsroot.txt> for details. 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds# not yet ready.. 1981da177e4SLinus Torvalds# bool ' IP: ARP support' CONFIG_IP_PNP_ARP 1991da177e4SLinus Torvaldsconfig NET_IPIP 2001da177e4SLinus Torvalds tristate "IP: tunneling" 201d2acc347SHerbert Xu select INET_TUNNEL 2021da177e4SLinus Torvalds ---help--- 2031da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 2041da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 2051da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 2061da177e4SLinus Torvalds encapsulation of IP within IP, which sounds kind of pointless, but 2071da177e4SLinus Torvalds can be useful if you want to make your (or some other) machine 2081da177e4SLinus Torvalds appear on a different network than it physically is, or to use 2091da177e4SLinus Torvalds mobile-IP facilities (allowing laptops to seamlessly move between 2101da177e4SLinus Torvalds networks without changing their IP addresses). 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds Saying Y to this option will produce two modules ( = code which can 2131da177e4SLinus Torvalds be inserted in and removed from the running kernel whenever you 2141da177e4SLinus Torvalds want). Most people won't need this and can say N. 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvaldsconfig NET_IPGRE 2171da177e4SLinus Torvalds tristate "IP: GRE tunnels over IP" 2181da177e4SLinus Torvalds help 2191da177e4SLinus Torvalds Tunneling means encapsulating data of one protocol type within 2201da177e4SLinus Torvalds another protocol and sending it over a channel that understands the 2211da177e4SLinus Torvalds encapsulating protocol. This particular tunneling driver implements 2221da177e4SLinus Torvalds GRE (Generic Routing Encapsulation) and at this time allows 2231da177e4SLinus Torvalds encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. 2241da177e4SLinus Torvalds This driver is useful if the other endpoint is a Cisco router: Cisco 2251da177e4SLinus Torvalds likes GRE much better than the other Linux tunneling driver ("IP 2261da177e4SLinus Torvalds tunneling" above). In addition, GRE allows multicast redistribution 2271da177e4SLinus Torvalds through the tunnel. 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvaldsconfig NET_IPGRE_BROADCAST 2301da177e4SLinus Torvalds bool "IP: broadcast GRE over IP" 2311da177e4SLinus Torvalds depends on IP_MULTICAST && NET_IPGRE 2321da177e4SLinus Torvalds help 2331da177e4SLinus Torvalds One application of GRE/IP is to construct a broadcast WAN (Wide Area 2341da177e4SLinus Torvalds Network), which looks like a normal Ethernet LAN (Local Area 2351da177e4SLinus Torvalds Network), but can be distributed all over the Internet. If you want 2361da177e4SLinus Torvalds to do that, say Y here and to "IP multicast routing" below. 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvaldsconfig IP_MROUTE 2391da177e4SLinus Torvalds bool "IP: multicast routing" 2401da177e4SLinus Torvalds depends on IP_MULTICAST 2411da177e4SLinus Torvalds help 2421da177e4SLinus Torvalds This is used if you want your machine to act as a router for IP 2431da177e4SLinus Torvalds packets that have several destination addresses. It is needed on the 2441da177e4SLinus Torvalds MBONE, a high bandwidth network on top of the Internet which carries 2451da177e4SLinus Torvalds audio and video broadcasts. In order to do that, you would most 2461da177e4SLinus Torvalds likely run the program mrouted. Information about the multicast 2471da177e4SLinus Torvalds capabilities of the various network cards is contained in 2481da177e4SLinus Torvalds <file:Documentation/networking/multicast.txt>. If you haven't heard 2491da177e4SLinus Torvalds about it, you don't need it. 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvaldsconfig IP_PIMSM_V1 2521da177e4SLinus Torvalds bool "IP: PIM-SM version 1 support" 2531da177e4SLinus Torvalds depends on IP_MROUTE 2541da177e4SLinus Torvalds help 2551da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM (Protocol Independent 2561da177e4SLinus Torvalds Multicast) version 1. This multicast routing protocol is used widely 2571da177e4SLinus Torvalds because Cisco supports it. You need special software to use it 2581da177e4SLinus Torvalds (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more 2591da177e4SLinus Torvalds information about PIM. 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds Say Y if you want to use PIM-SM v1. Note that you can say N here if 2621da177e4SLinus Torvalds you just want to use Dense Mode PIM. 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvaldsconfig IP_PIMSM_V2 2651da177e4SLinus Torvalds bool "IP: PIM-SM version 2 support" 2661da177e4SLinus Torvalds depends on IP_MROUTE 2671da177e4SLinus Torvalds help 2681da177e4SLinus Torvalds Kernel side support for Sparse Mode PIM version 2. In order to use 2691da177e4SLinus Torvalds this, you need an experimental routing daemon supporting it (pimd or 2701da177e4SLinus Torvalds gated-5). This routing protocol is not used widely, so say N unless 2711da177e4SLinus Torvalds you want to play with it. 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvaldsconfig ARPD 2741da177e4SLinus Torvalds bool "IP: ARP daemon support (EXPERIMENTAL)" 2756a2e9b73SSam Ravnborg depends on EXPERIMENTAL 2761da177e4SLinus Torvalds ---help--- 2771da177e4SLinus Torvalds Normally, the kernel maintains an internal cache which maps IP 2781da177e4SLinus Torvalds addresses to hardware addresses on the local network, so that 2791da177e4SLinus Torvalds Ethernet/Token Ring/ etc. frames are sent to the proper address on 2801da177e4SLinus Torvalds the physical networking layer. For small networks having a few 2811da177e4SLinus Torvalds hundred directly connected hosts or less, keeping this address 2821da177e4SLinus Torvalds resolution (ARP) cache inside the kernel works well. However, 2831da177e4SLinus Torvalds maintaining an internal ARP cache does not work well for very large 2841da177e4SLinus Torvalds switched networks, and will use a lot of kernel memory if TCP/IP 2851da177e4SLinus Torvalds connections are made to many machines on the network. 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds If you say Y here, the kernel's internal ARP cache will never grow 2881da177e4SLinus Torvalds to more than 256 entries (the oldest entries are expired in a LIFO 2891da177e4SLinus Torvalds manner) and communication will be attempted with the user space ARP 2901da177e4SLinus Torvalds daemon arpd. Arpd then answers the address resolution request either 2911da177e4SLinus Torvalds from its own cache or by asking the net. 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds This code is experimental and also obsolete. If you want to use it, 2941da177e4SLinus Torvalds you need to find a version of the daemon arpd on the net somewhere, 2951da177e4SLinus Torvalds and you should also say Y to "Kernel/User network link driver", 2961da177e4SLinus Torvalds below. If unsure, say N. 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvaldsconfig SYN_COOKIES 2991da177e4SLinus Torvalds bool "IP: TCP syncookie support (disabled per default)" 3001da177e4SLinus Torvalds ---help--- 3011da177e4SLinus Torvalds Normal TCP/IP networking is open to an attack known as "SYN 3021da177e4SLinus Torvalds flooding". This denial-of-service attack prevents legitimate remote 3031da177e4SLinus Torvalds users from being able to connect to your computer during an ongoing 3041da177e4SLinus Torvalds attack and requires very little work from the attacker, who can 3051da177e4SLinus Torvalds operate from anywhere on the Internet. 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds SYN cookies provide protection against this type of attack. If you 3081da177e4SLinus Torvalds say Y here, the TCP/IP stack will use a cryptographic challenge 3091da177e4SLinus Torvalds protocol known as "SYN cookies" to enable legitimate users to 3101da177e4SLinus Torvalds continue to connect, even when your machine is under attack. There 3111da177e4SLinus Torvalds is no need for the legitimate users to change their TCP/IP software; 3121da177e4SLinus Torvalds SYN cookies work transparently to them. For technical information 3131da177e4SLinus Torvalds about SYN cookies, check out <http://cr.yp.to/syncookies.html>. 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds If you are SYN flooded, the source address reported by the kernel is 3161da177e4SLinus Torvalds likely to have been forged by the attacker; it is only reported as 3171da177e4SLinus Torvalds an aid in tracing the packets to their actual source and should not 3181da177e4SLinus Torvalds be taken as absolute truth. 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds SYN cookies may prevent correct error reporting on clients when the 3211da177e4SLinus Torvalds server is really overloaded. If this happens frequently better turn 3221da177e4SLinus Torvalds them off. 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds If you say Y here, note that SYN cookies aren't enabled by default; 3251da177e4SLinus Torvalds you can enable them by saying Y to "/proc file system support" and 3261da177e4SLinus Torvalds "Sysctl support" below and executing the command 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds echo 1 >/proc/sys/net/ipv4/tcp_syncookies 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds at boot time after the /proc file system has been mounted. 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds If unsure, say N. 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvaldsconfig INET_AH 3351da177e4SLinus Torvalds tristate "IP: AH transformation" 3361da177e4SLinus Torvalds select XFRM 3371da177e4SLinus Torvalds select CRYPTO 3381da177e4SLinus Torvalds select CRYPTO_HMAC 3391da177e4SLinus Torvalds select CRYPTO_MD5 3401da177e4SLinus Torvalds select CRYPTO_SHA1 3411da177e4SLinus Torvalds ---help--- 3421da177e4SLinus Torvalds Support for IPsec AH. 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds If unsure, say Y. 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvaldsconfig INET_ESP 3471da177e4SLinus Torvalds tristate "IP: ESP transformation" 3481da177e4SLinus Torvalds select XFRM 3491da177e4SLinus Torvalds select CRYPTO 350ed58dd41SHerbert Xu select CRYPTO_AUTHENC 3511da177e4SLinus Torvalds select CRYPTO_HMAC 3521da177e4SLinus Torvalds select CRYPTO_MD5 3536b7326c8SHerbert Xu select CRYPTO_CBC 3541da177e4SLinus Torvalds select CRYPTO_SHA1 3551da177e4SLinus Torvalds select CRYPTO_DES 3561da177e4SLinus Torvalds ---help--- 3571da177e4SLinus Torvalds Support for IPsec ESP. 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds If unsure, say Y. 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvaldsconfig INET_IPCOMP 3621da177e4SLinus Torvalds tristate "IP: IPComp transformation" 363d2acc347SHerbert Xu select INET_XFRM_TUNNEL 3646fccab67SHerbert Xu select XFRM_IPCOMP 3651da177e4SLinus Torvalds ---help--- 3661da177e4SLinus Torvalds Support for IP Payload Compression Protocol (IPComp) (RFC3173), 3671da177e4SLinus Torvalds typically needed for IPsec. 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds If unsure, say Y. 3701da177e4SLinus Torvalds 371d2acc347SHerbert Xuconfig INET_XFRM_TUNNEL 372d2acc347SHerbert Xu tristate 373d2acc347SHerbert Xu select INET_TUNNEL 374d2acc347SHerbert Xu default n 3751da177e4SLinus Torvalds 376d2acc347SHerbert Xuconfig INET_TUNNEL 377d2acc347SHerbert Xu tristate 378d2acc347SHerbert Xu default n 3791da177e4SLinus Torvalds 380b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TRANSPORT 381b59f45d0SHerbert Xu tristate "IP: IPsec transport mode" 382b59f45d0SHerbert Xu default y 383b59f45d0SHerbert Xu select XFRM 384b59f45d0SHerbert Xu ---help--- 385b59f45d0SHerbert Xu Support for IPsec transport mode. 386b59f45d0SHerbert Xu 387b59f45d0SHerbert Xu If unsure, say Y. 388b59f45d0SHerbert Xu 389b59f45d0SHerbert Xuconfig INET_XFRM_MODE_TUNNEL 390b59f45d0SHerbert Xu tristate "IP: IPsec tunnel mode" 391b59f45d0SHerbert Xu default y 392b59f45d0SHerbert Xu select XFRM 393b59f45d0SHerbert Xu ---help--- 394b59f45d0SHerbert Xu Support for IPsec tunnel mode. 395b59f45d0SHerbert Xu 396b59f45d0SHerbert Xu If unsure, say Y. 397b59f45d0SHerbert Xu 3980a69452cSDiego Beltramiconfig INET_XFRM_MODE_BEET 3990a69452cSDiego Beltrami tristate "IP: IPsec BEET mode" 4000a69452cSDiego Beltrami default y 4010a69452cSDiego Beltrami select XFRM 4020a69452cSDiego Beltrami ---help--- 4030a69452cSDiego Beltrami Support for IPsec BEET mode. 4040a69452cSDiego Beltrami 4050a69452cSDiego Beltrami If unsure, say Y. 4060a69452cSDiego Beltrami 40771c87e0cSJan-Bernd Themannconfig INET_LRO 40871c87e0cSJan-Bernd Themann tristate "Large Receive Offload (ipv4/tcp)" 40971c87e0cSJan-Bernd Themann 41071c87e0cSJan-Bernd Themann ---help--- 41171c87e0cSJan-Bernd Themann Support for Large Receive Offload (ipv4/tcp). 41271c87e0cSJan-Bernd Themann 41371c87e0cSJan-Bernd Themann If unsure, say Y. 41471c87e0cSJan-Bernd Themann 41517b085eaSArnaldo Carvalho de Meloconfig INET_DIAG 41617b085eaSArnaldo Carvalho de Melo tristate "INET: socket monitoring interface" 4171da177e4SLinus Torvalds default y 4181da177e4SLinus Torvalds ---help--- 41973c1f4a0SArnaldo Carvalho de Melo Support for INET (TCP, DCCP, etc) socket monitoring interface used by 42073c1f4a0SArnaldo Carvalho de Melo native Linux tools such as ss. ss is included in iproute2, currently 421f4b9479dSBaruch Even downloadable at <http://linux-net.osdl.org/index.php/Iproute2>. 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds If unsure, say Y. 4241da177e4SLinus Torvalds 42517b085eaSArnaldo Carvalho de Meloconfig INET_TCP_DIAG 42617b085eaSArnaldo Carvalho de Melo depends on INET_DIAG 42717b085eaSArnaldo Carvalho de Melo def_tristate INET_DIAG 42817b085eaSArnaldo Carvalho de Melo 4293d2573f7SStephen Hemmingermenuconfig TCP_CONG_ADVANCED 430a6484045SDavid S. Miller bool "TCP: advanced congestion control" 431a6484045SDavid S. Miller ---help--- 432a6484045SDavid S. Miller Support for selection of various TCP congestion control 433a6484045SDavid S. Miller modules. 434a6484045SDavid S. Miller 435a6484045SDavid S. Miller Nearly all users can safely say no here, and a safe default 436597811ecSStephen Hemminger selection will be made (CUBIC with new Reno as a fallback). 437a6484045SDavid S. Miller 438a6484045SDavid S. Miller If unsure, say N. 439a6484045SDavid S. Miller 4403d2573f7SStephen Hemmingerif TCP_CONG_ADVANCED 44183803034SStephen Hemminger 44283803034SStephen Hemmingerconfig TCP_CONG_BIC 44383803034SStephen Hemminger tristate "Binary Increase Congestion (BIC) control" 444597811ecSStephen Hemminger default m 44583803034SStephen Hemminger ---help--- 44683803034SStephen Hemminger BIC-TCP is a sender-side only change that ensures a linear RTT 44783803034SStephen Hemminger fairness under large windows while offering both scalability and 44883803034SStephen Hemminger bounded TCP-friendliness. The protocol combines two schemes 44983803034SStephen Hemminger called additive increase and binary search increase. When the 45083803034SStephen Hemminger congestion window is large, additive increase with a large 45183803034SStephen Hemminger increment ensures linear RTT fairness as well as good 45283803034SStephen Hemminger scalability. Under small congestion windows, binary search 45383803034SStephen Hemminger increase provides TCP friendliness. 45483803034SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/ 45583803034SStephen Hemminger 456df3271f3SStephen Hemmingerconfig TCP_CONG_CUBIC 457df3271f3SStephen Hemminger tristate "CUBIC TCP" 458597811ecSStephen Hemminger default y 459df3271f3SStephen Hemminger ---help--- 460df3271f3SStephen Hemminger This is version 2.0 of BIC-TCP which uses a cubic growth function 461df3271f3SStephen Hemminger among other techniques. 462df3271f3SStephen Hemminger See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf 463df3271f3SStephen Hemminger 46487270762SStephen Hemmingerconfig TCP_CONG_WESTWOOD 46587270762SStephen Hemminger tristate "TCP Westwood+" 46687270762SStephen Hemminger default m 46787270762SStephen Hemminger ---help--- 46887270762SStephen Hemminger TCP Westwood+ is a sender-side only modification of the TCP Reno 46987270762SStephen Hemminger protocol stack that optimizes the performance of TCP congestion 47087270762SStephen Hemminger control. It is based on end-to-end bandwidth estimation to set 47187270762SStephen Hemminger congestion window and slow start threshold after a congestion 47287270762SStephen Hemminger episode. Using this estimation, TCP Westwood+ adaptively sets a 47387270762SStephen Hemminger slow start threshold and a congestion window which takes into 47487270762SStephen Hemminger account the bandwidth used at the time congestion is experienced. 47587270762SStephen Hemminger TCP Westwood+ significantly increases fairness wrt TCP Reno in 47687270762SStephen Hemminger wired networks and throughput over wireless links. 47787270762SStephen Hemminger 478a7868ea6SBaruch Evenconfig TCP_CONG_HTCP 479a7868ea6SBaruch Even tristate "H-TCP" 480a7868ea6SBaruch Even default m 481a7868ea6SBaruch Even ---help--- 482a7868ea6SBaruch Even H-TCP is a send-side only modifications of the TCP Reno 483a7868ea6SBaruch Even protocol stack that optimizes the performance of TCP 484a7868ea6SBaruch Even congestion control for high speed network links. It uses a 485a7868ea6SBaruch Even modeswitch to change the alpha and beta parameters of TCP Reno 486a7868ea6SBaruch Even based on network conditions and in a way so as to be fair with 487a7868ea6SBaruch Even other Reno and H-TCP flows. 488a7868ea6SBaruch Even 489a628d29bSJohn Heffnerconfig TCP_CONG_HSTCP 490a628d29bSJohn Heffner tristate "High Speed TCP" 4916a2e9b73SSam Ravnborg depends on EXPERIMENTAL 492a628d29bSJohn Heffner default n 493a628d29bSJohn Heffner ---help--- 494a628d29bSJohn Heffner Sally Floyd's High Speed TCP (RFC 3649) congestion control. 495a628d29bSJohn Heffner A modification to TCP's congestion control mechanism for use 496a628d29bSJohn Heffner with large congestion windows. A table indicates how much to 497a628d29bSJohn Heffner increase the congestion window by when an ACK is received. 498a628d29bSJohn Heffner For more detail see http://www.icir.org/floyd/hstcp.html 499a628d29bSJohn Heffner 500835b3f0cSDaniele Lacameraconfig TCP_CONG_HYBLA 501835b3f0cSDaniele Lacamera tristate "TCP-Hybla congestion control algorithm" 5026a2e9b73SSam Ravnborg depends on EXPERIMENTAL 503835b3f0cSDaniele Lacamera default n 504835b3f0cSDaniele Lacamera ---help--- 505835b3f0cSDaniele Lacamera TCP-Hybla is a sender-side only change that eliminates penalization of 506835b3f0cSDaniele Lacamera long-RTT, large-bandwidth connections, like when satellite legs are 50744c09201SMatt LaPlante involved, especially when sharing a common bottleneck with normal 508835b3f0cSDaniele Lacamera terrestrial connections. 509835b3f0cSDaniele Lacamera 510b87d8561SStephen Hemmingerconfig TCP_CONG_VEGAS 511b87d8561SStephen Hemminger tristate "TCP Vegas" 5126a2e9b73SSam Ravnborg depends on EXPERIMENTAL 513b87d8561SStephen Hemminger default n 514b87d8561SStephen Hemminger ---help--- 515b87d8561SStephen Hemminger TCP Vegas is a sender-side only change to TCP that anticipates 516b87d8561SStephen Hemminger the onset of congestion by estimating the bandwidth. TCP Vegas 517b87d8561SStephen Hemminger adjusts the sending rate by modifying the congestion 518b87d8561SStephen Hemminger window. TCP Vegas should provide less packet loss, but it is 519b87d8561SStephen Hemminger not as aggressive as TCP Reno. 520b87d8561SStephen Hemminger 5210e57976bSJohn Heffnerconfig TCP_CONG_SCALABLE 5220e57976bSJohn Heffner tristate "Scalable TCP" 5236a2e9b73SSam Ravnborg depends on EXPERIMENTAL 5240e57976bSJohn Heffner default n 5250e57976bSJohn Heffner ---help--- 5260e57976bSJohn Heffner Scalable TCP is a sender-side only change to TCP which uses a 5270e57976bSJohn Heffner MIMD congestion control algorithm which has some nice scaling 5280e57976bSJohn Heffner properties, though is known to have fairness issues. 529f4b9479dSBaruch Even See http://www.deneholme.net/tom/scalable/ 530a7868ea6SBaruch Even 5317c106d7eSWong Hoi Sing Edisonconfig TCP_CONG_LP 5327c106d7eSWong Hoi Sing Edison tristate "TCP Low Priority" 5337c106d7eSWong Hoi Sing Edison depends on EXPERIMENTAL 5347c106d7eSWong Hoi Sing Edison default n 5357c106d7eSWong Hoi Sing Edison ---help--- 5367c106d7eSWong Hoi Sing Edison TCP Low Priority (TCP-LP), a distributed algorithm whose goal is 537cab00891SMatt LaPlante to utilize only the excess network bandwidth as compared to the 5387c106d7eSWong Hoi Sing Edison ``fair share`` of bandwidth as targeted by TCP. 5397c106d7eSWong Hoi Sing Edison See http://www-ece.rice.edu/networks/TCP-LP/ 5407c106d7eSWong Hoi Sing Edison 54176f10177SBin Zhouconfig TCP_CONG_VENO 54276f10177SBin Zhou tristate "TCP Veno" 54376f10177SBin Zhou depends on EXPERIMENTAL 54476f10177SBin Zhou default n 54576f10177SBin Zhou ---help--- 54676f10177SBin Zhou TCP Veno is a sender-side only enhancement of TCP to obtain better 54776f10177SBin Zhou throughput over wireless networks. TCP Veno makes use of state 54876f10177SBin Zhou distinguishing to circumvent the difficult judgment of the packet loss 54976f10177SBin Zhou type. TCP Veno cuts down less congestion window in response to random 55076f10177SBin Zhou loss packets. 55176f10177SBin Zhou See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf 55276f10177SBin Zhou 5535ef81475SAngelo P. Castellaniconfig TCP_CONG_YEAH 5545ef81475SAngelo P. Castellani tristate "YeAH TCP" 5555ef81475SAngelo P. Castellani depends on EXPERIMENTAL 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 depends on EXPERIMENTAL 571c462238dSStephen Hemminger default n 572c462238dSStephen Hemminger ---help--- 57301dd2fbfSMatt LaPlante TCP-Illinois is a sender-side modification of TCP Reno for 574c462238dSStephen Hemminger high speed long delay links. It uses round-trip-time to 575c462238dSStephen Hemminger adjust the alpha and beta parameters to achieve a higher average 576c462238dSStephen Hemminger throughput and maintain fairness. 577c462238dSStephen Hemminger 578c462238dSStephen Hemminger For further details see: 579c462238dSStephen Hemminger http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html 580c462238dSStephen Hemminger 5813d2573f7SStephen Hemmingerchoice 5823d2573f7SStephen Hemminger prompt "Default TCP congestion control" 583597811ecSStephen Hemminger default DEFAULT_CUBIC 5843d2573f7SStephen Hemminger help 5853d2573f7SStephen Hemminger Select the TCP congestion control that will be used by default 5863d2573f7SStephen Hemminger for all connections. 5873d2573f7SStephen Hemminger 5883d2573f7SStephen Hemminger config DEFAULT_BIC 5893d2573f7SStephen Hemminger bool "Bic" if TCP_CONG_BIC=y 5903d2573f7SStephen Hemminger 5913d2573f7SStephen Hemminger config DEFAULT_CUBIC 5923d2573f7SStephen Hemminger bool "Cubic" if TCP_CONG_CUBIC=y 5933d2573f7SStephen Hemminger 5943d2573f7SStephen Hemminger config DEFAULT_HTCP 5953d2573f7SStephen Hemminger bool "Htcp" if TCP_CONG_HTCP=y 5963d2573f7SStephen Hemminger 5973d2573f7SStephen Hemminger config DEFAULT_VEGAS 5983d2573f7SStephen Hemminger bool "Vegas" if TCP_CONG_VEGAS=y 5993d2573f7SStephen Hemminger 6003d2573f7SStephen Hemminger config DEFAULT_WESTWOOD 6013d2573f7SStephen Hemminger bool "Westwood" if TCP_CONG_WESTWOOD=y 6023d2573f7SStephen Hemminger 6033d2573f7SStephen Hemminger config DEFAULT_RENO 6043d2573f7SStephen Hemminger bool "Reno" 6053d2573f7SStephen Hemminger 6063d2573f7SStephen Hemmingerendchoice 6073d2573f7SStephen Hemminger 6083d2573f7SStephen Hemmingerendif 60983803034SStephen Hemminger 610597811ecSStephen Hemmingerconfig TCP_CONG_CUBIC 6116c360767SDavid S. Miller tristate 612a6484045SDavid S. Miller depends on !TCP_CONG_ADVANCED 613a6484045SDavid S. Miller default y 614a6484045SDavid S. Miller 6153d2573f7SStephen Hemmingerconfig DEFAULT_TCP_CONG 6163d2573f7SStephen Hemminger string 6173d2573f7SStephen Hemminger default "bic" if DEFAULT_BIC 6183d2573f7SStephen Hemminger default "cubic" if DEFAULT_CUBIC 6193d2573f7SStephen Hemminger default "htcp" if DEFAULT_HTCP 6203d2573f7SStephen Hemminger default "vegas" if DEFAULT_VEGAS 6213d2573f7SStephen Hemminger default "westwood" if DEFAULT_WESTWOOD 6223d2573f7SStephen Hemminger default "reno" if DEFAULT_RENO 623597811ecSStephen Hemminger default "cubic" 6243d2573f7SStephen Hemminger 625cfb6eeb4SYOSHIFUJI Hideakiconfig TCP_MD5SIG 626cfb6eeb4SYOSHIFUJI Hideaki bool "TCP: MD5 Signature Option support (RFC2385) (EXPERIMENTAL)" 627cfb6eeb4SYOSHIFUJI Hideaki depends on EXPERIMENTAL 628cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO 629cfb6eeb4SYOSHIFUJI Hideaki select CRYPTO_MD5 630cfb6eeb4SYOSHIFUJI Hideaki ---help--- 6313dde6ad8SDavid Sterba RFC2385 specifies a method of giving MD5 protection to TCP sessions. 632cfb6eeb4SYOSHIFUJI Hideaki Its main (only?) use is to protect BGP sessions between core routers 633cfb6eeb4SYOSHIFUJI Hideaki on the Internet. 634cfb6eeb4SYOSHIFUJI Hideaki 635cfb6eeb4SYOSHIFUJI Hideaki If unsure, say N. 636cfb6eeb4SYOSHIFUJI Hideaki 637