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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# IP configuration
3#
Linus Torvalds1da177e2005-04-16 15:20:36 -07004config IP_MULTICAST
5 bool "IP: multicasting"
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 help
7 This is code for addressing several networked computers at once,
8 enlarging your kernel by about 2 KB. You need multicasting if you
9 intend to participate in the MBONE, a high bandwidth network on top
10 of the Internet which carries audio and video broadcasts. More
11 information about the MBONE is on the WWW at
Adrian Bunk936bb142007-02-17 19:49:13 +010012 <http://www.savetz.com/mbone/>. Information about the multicast
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 capabilities of the various network cards is contained in
14 <file:Documentation/networking/multicast.txt>. For most people, it's
15 safe to say N.
16
17config IP_ADVANCED_ROUTER
18 bool "IP: advanced router"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 ---help---
20 If you intend to run your Linux box mostly as a router, i.e. as a
21 computer that forwards and redistributes network packets, say Y; you
22 will then be presented with several options that allow more precise
23 control about the routing process.
24
25 The answer to this question won't directly affect the kernel:
26 answering N will just cause the configurator to skip all the
27 questions about advanced routing.
28
29 Note that your box can only act as a router if you enable IP
30 forwarding in your kernel; you can do that by saying Y to "/proc
31 file system support" and "Sysctl support" below and executing the
32 line
33
34 echo "1" > /proc/sys/net/ipv4/ip_forward
35
36 at boot time after the /proc file system has been mounted.
37
Jesper Dangaard Brouerb2cc46a2009-02-22 00:06:20 -080038 If you turn on IP forwarding, you should consider the rp_filter, which
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 automatically rejects incoming packets if the routing table entry
40 for their source address doesn't match the network interface they're
41 arriving on. This has security advantages because it prevents the
42 so-called IP spoofing, however it can pose problems if you use
43 asymmetric routing (packets from you to a host take a different path
44 than packets from that host to you) or if you operate a non-routing
45 host which has several IP addresses on different interfaces. To turn
Dave Jonesd7394372007-05-17 15:02:21 -070046 rp_filter on use:
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Dave Jonesd7394372007-05-17 15:02:21 -070048 echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter
Jesper Dangaard Brouerb2cc46a2009-02-22 00:06:20 -080049 and
Dave Jonesd7394372007-05-17 15:02:21 -070050 echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Jesper Dangaard Brouerb2cc46a2009-02-22 00:06:20 -080052 Note that some distributions enable it in startup scripts.
Jesper Dangaard Brouerd18921a2009-02-23 04:40:43 +000053 For details about rp_filter strict and loose mode read
54 <file:Documentation/networking/ip-sysctl.txt>.
Jesper Dangaard Brouerb2cc46a2009-02-22 00:06:20 -080055
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 If unsure, say N here.
57
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -080058choice
David S. Millerbb298ca2005-06-24 17:50:53 -070059 prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)"
60 depends on IP_ADVANCED_ROUTER
Adrian Bunk6876f952005-07-18 13:55:19 -070061 default ASK_IP_FIB_HASH
David S. Millerbb298ca2005-06-24 17:50:53 -070062
Adrian Bunk6876f952005-07-18 13:55:19 -070063config ASK_IP_FIB_HASH
David S. Millerbb298ca2005-06-24 17:50:53 -070064 bool "FIB_HASH"
65 ---help---
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -080066 Current FIB is very proven and good enough for most users.
David S. Millerbb298ca2005-06-24 17:50:53 -070067
68config IP_FIB_TRIE
69 bool "FIB_TRIE"
70 ---help---
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -080071 Use new experimental LC-trie as FIB lookup algorithm.
72 This improves lookup performance if you have a large
73 number of routes.
David S. Millerbb298ca2005-06-24 17:50:53 -070074
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -080075 LC-trie is a longest matching prefix lookup algorithm which
76 performs better than FIB_HASH for large routing tables.
77 But, it consumes more memory and is more complex.
78
79 LC-trie is described in:
80
81 IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
82 IEEE Journal on Selected Areas in Communications, 17(6):1083-1092,
83 June 1999
84
85 An experimental study of compression methods for dynamic tries
86 Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
87 http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/
88
David S. Millerbb298ca2005-06-24 17:50:53 -070089endchoice
90
David S. Millerbb298ca2005-06-24 17:50:53 -070091config IP_FIB_HASH
Adrian Bunk6876f952005-07-18 13:55:19 -070092 def_bool ASK_IP_FIB_HASH || !IP_ADVANCED_ROUTER
David S. Millerbb298ca2005-06-24 17:50:53 -070093
Stephen Hemminger66a2f7f2008-01-12 21:23:17 -080094config IP_FIB_TRIE_STATS
95 bool "FIB TRIE statistics"
96 depends on IP_FIB_TRIE
97 ---help---
98 Keep track of statistics on structure of FIB TRIE table.
99 Useful for testing and measuring TRIE performance.
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101config IP_MULTIPLE_TABLES
102 bool "IP: policy routing"
103 depends on IP_ADVANCED_ROUTER
Thomas Grafe1ef4bf2006-08-04 03:39:22 -0700104 select FIB_RULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 ---help---
106 Normally, a router decides what to do with a received packet based
107 solely on the packet's final destination address. If you say Y here,
108 the Linux router will also be able to take the packet's source
109 address into account. Furthermore, the TOS (Type-Of-Service) field
110 of the packet can be used for routing decisions as well.
111
112 If you are interested in this, please see the preliminary
113 documentation at <http://www.compendium.com.ar/policy-routing.txt>
114 and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>.
115 You will need supporting software from
116 <ftp://ftp.tux.org/pub/net/ip-routing/>.
117
118 If unsure, say N.
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120config IP_ROUTE_MULTIPATH
121 bool "IP: equal cost multipath"
122 depends on IP_ADVANCED_ROUTER
123 help
124 Normally, the routing tables specify a single action to be taken in
125 a deterministic manner for a given packet. If you say Y here
126 however, it becomes possible to attach several actions to a packet
127 pattern, in effect specifying several alternative paths to travel
128 for those packets. The router considers all these paths to be of
129 equal "cost" and chooses one of them in a non-deterministic fashion
130 if a matching packet arrives.
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132config IP_ROUTE_VERBOSE
133 bool "IP: verbose route monitoring"
134 depends on IP_ADVANCED_ROUTER
135 help
136 If you say Y here, which is recommended, then the kernel will print
137 verbose messages regarding the routing, for example warnings about
138 received packets which look strange and could be evidence of an
139 attack or a misconfigured system somewhere. The information is
140 handled by the klogd daemon which is responsible for kernel messages
141 ("man klogd").
142
143config IP_PNP
144 bool "IP: kernel level autoconfiguration"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 help
146 This enables automatic configuration of IP addresses of devices and
147 of the routing table during kernel boot, based on either information
148 supplied on the kernel command line or by BOOTP or RARP protocols.
149 You need to say Y only for diskless machines requiring network
150 access to boot (in which case you want to say Y to "Root file system
151 on NFS" as well), because all other machines configure the network
152 in their startup scripts.
153
154config IP_PNP_DHCP
155 bool "IP: DHCP support"
156 depends on IP_PNP
157 ---help---
158 If you want your Linux box to mount its whole root file system (the
159 one containing the directory /) from some other computer over the
160 net via NFS and you want the IP address of your computer to be
161 discovered automatically at boot time using the DHCP protocol (a
162 special protocol designed for doing this job), say Y here. In case
163 the boot ROM of your network card was designed for booting Linux and
164 does DHCP itself, providing all necessary information on the kernel
165 command line, you can say N here.
166
167 If unsure, say Y. Note that if you want to use DHCP, a DHCP server
168 must be operating on your network. Read
J. Bruce Fieldsdc7a0812009-10-27 14:41:35 -0400169 <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171config IP_PNP_BOOTP
172 bool "IP: BOOTP support"
173 depends on IP_PNP
174 ---help---
175 If you want your Linux box to mount its whole root file system (the
176 one containing the directory /) from some other computer over the
177 net via NFS and you want the IP address of your computer to be
178 discovered automatically at boot time using the BOOTP protocol (a
179 special protocol designed for doing this job), say Y here. In case
180 the boot ROM of your network card was designed for booting Linux and
181 does BOOTP itself, providing all necessary information on the kernel
182 command line, you can say N here. If unsure, say Y. Note that if you
183 want to use BOOTP, a BOOTP server must be operating on your network.
J. Bruce Fieldsdc7a0812009-10-27 14:41:35 -0400184 Read <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186config IP_PNP_RARP
187 bool "IP: RARP support"
188 depends on IP_PNP
189 help
190 If you want your Linux box to mount its whole root file system (the
191 one containing the directory /) from some other computer over the
192 net via NFS and you want the IP address of your computer to be
193 discovered automatically at boot time using the RARP protocol (an
194 older protocol which is being obsoleted by BOOTP and DHCP), say Y
195 here. Note that if you want to use RARP, a RARP server must be
J. Bruce Fields6ded55d2008-04-07 15:59:03 -0400196 operating on your network. Read
J. Bruce Fieldsdc7a0812009-10-27 14:41:35 -0400197 <file:Documentation/filesystems/nfs/nfsroot.txt> for details.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199# not yet ready..
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -0800200# bool ' IP: ARP support' CONFIG_IP_PNP_ARP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201config NET_IPIP
202 tristate "IP: tunneling"
Herbert Xud2acc342006-03-28 01:12:13 -0800203 select INET_TUNNEL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 ---help---
205 Tunneling means encapsulating data of one protocol type within
206 another protocol and sending it over a channel that understands the
207 encapsulating protocol. This particular tunneling driver implements
208 encapsulation of IP within IP, which sounds kind of pointless, but
209 can be useful if you want to make your (or some other) machine
210 appear on a different network than it physically is, or to use
211 mobile-IP facilities (allowing laptops to seamlessly move between
212 networks without changing their IP addresses).
213
214 Saying Y to this option will produce two modules ( = code which can
215 be inserted in and removed from the running kernel whenever you
216 want). Most people won't need this and can say N.
217
218config NET_IPGRE
219 tristate "IP: GRE tunnels over IP"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 help
221 Tunneling means encapsulating data of one protocol type within
222 another protocol and sending it over a channel that understands the
223 encapsulating protocol. This particular tunneling driver implements
224 GRE (Generic Routing Encapsulation) and at this time allows
225 encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure.
226 This driver is useful if the other endpoint is a Cisco router: Cisco
227 likes GRE much better than the other Linux tunneling driver ("IP
228 tunneling" above). In addition, GRE allows multicast redistribution
229 through the tunnel.
230
231config NET_IPGRE_BROADCAST
232 bool "IP: broadcast GRE over IP"
233 depends on IP_MULTICAST && NET_IPGRE
234 help
235 One application of GRE/IP is to construct a broadcast WAN (Wide Area
236 Network), which looks like a normal Ethernet LAN (Local Area
237 Network), but can be distributed all over the Internet. If you want
238 to do that, say Y here and to "IP multicast routing" below.
239
240config IP_MROUTE
241 bool "IP: multicast routing"
242 depends on IP_MULTICAST
243 help
244 This is used if you want your machine to act as a router for IP
245 packets that have several destination addresses. It is needed on the
246 MBONE, a high bandwidth network on top of the Internet which carries
247 audio and video broadcasts. In order to do that, you would most
248 likely run the program mrouted. Information about the multicast
249 capabilities of the various network cards is contained in
250 <file:Documentation/networking/multicast.txt>. If you haven't heard
251 about it, you don't need it.
252
Patrick McHardyf0ad0862010-04-13 05:03:23 +0000253config IP_MROUTE_MULTIPLE_TABLES
254 bool "IP: multicast policy routing"
Patrick McHardy66496d42010-04-15 13:29:27 +0200255 depends on IP_MROUTE && IP_ADVANCED_ROUTER
Patrick McHardyf0ad0862010-04-13 05:03:23 +0000256 select FIB_RULES
257 help
258 Normally, a multicast router runs a userspace daemon and decides
259 what to do with a multicast packet based on the source and
260 destination addresses. If you say Y here, the multicast router
261 will also be able to take interfaces and packet marks into
262 account and run multiple instances of userspace daemons
263 simultaneously, each one handling a single table.
264
265 If unsure, say N.
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267config IP_PIMSM_V1
268 bool "IP: PIM-SM version 1 support"
269 depends on IP_MROUTE
270 help
271 Kernel side support for Sparse Mode PIM (Protocol Independent
272 Multicast) version 1. This multicast routing protocol is used widely
273 because Cisco supports it. You need special software to use it
274 (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more
275 information about PIM.
276
277 Say Y if you want to use PIM-SM v1. Note that you can say N here if
278 you just want to use Dense Mode PIM.
279
280config IP_PIMSM_V2
281 bool "IP: PIM-SM version 2 support"
282 depends on IP_MROUTE
283 help
284 Kernel side support for Sparse Mode PIM version 2. In order to use
285 this, you need an experimental routing daemon supporting it (pimd or
286 gated-5). This routing protocol is not used widely, so say N unless
287 you want to play with it.
288
289config ARPD
Timo Teräse61a4b62009-06-11 19:38:02 +0000290 bool "IP: ARP daemon support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 ---help---
Timo Teräse61a4b62009-06-11 19:38:02 +0000292 The kernel maintains an internal cache which maps IP addresses to
293 hardware addresses on the local network, so that Ethernet/Token Ring/
294 etc. frames are sent to the proper address on the physical networking
295 layer. Normally, kernel uses the ARP protocol to resolve these
296 mappings.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Timo Teräse61a4b62009-06-11 19:38:02 +0000298 Saying Y here adds support to have an user space daemon to do this
299 resolution instead. This is useful for implementing an alternate
300 address resolution protocol (e.g. NHRP on mGRE tunnels) and also for
301 testing purposes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Timo Teräse61a4b62009-06-11 19:38:02 +0000303 If unsure, say N.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305config SYN_COOKIES
Florian Westphal57f15532010-06-03 00:42:30 +0000306 bool "IP: TCP syncookie support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 ---help---
308 Normal TCP/IP networking is open to an attack known as "SYN
309 flooding". This denial-of-service attack prevents legitimate remote
310 users from being able to connect to your computer during an ongoing
311 attack and requires very little work from the attacker, who can
312 operate from anywhere on the Internet.
313
314 SYN cookies provide protection against this type of attack. If you
315 say Y here, the TCP/IP stack will use a cryptographic challenge
316 protocol known as "SYN cookies" to enable legitimate users to
317 continue to connect, even when your machine is under attack. There
318 is no need for the legitimate users to change their TCP/IP software;
319 SYN cookies work transparently to them. For technical information
320 about SYN cookies, check out <http://cr.yp.to/syncookies.html>.
321
322 If you are SYN flooded, the source address reported by the kernel is
323 likely to have been forged by the attacker; it is only reported as
324 an aid in tracing the packets to their actual source and should not
325 be taken as absolute truth.
326
327 SYN cookies may prevent correct error reporting on clients when the
328 server is really overloaded. If this happens frequently better turn
329 them off.
330
Florian Westphal57f15532010-06-03 00:42:30 +0000331 If you say Y here, you can disable SYN cookies at run time by
332 saying Y to "/proc file system support" and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 "Sysctl support" below and executing the command
334
Florian Westphal57f15532010-06-03 00:42:30 +0000335 echo 0 > /proc/sys/net/ipv4/tcp_syncookies
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Florian Westphal57f15532010-06-03 00:42:30 +0000337 after the /proc file system has been mounted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 If unsure, say N.
340
341config INET_AH
342 tristate "IP: AH transformation"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 select XFRM
344 select CRYPTO
345 select CRYPTO_HMAC
346 select CRYPTO_MD5
347 select CRYPTO_SHA1
348 ---help---
349 Support for IPsec AH.
350
351 If unsure, say Y.
352
353config INET_ESP
354 tristate "IP: ESP transformation"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 select XFRM
356 select CRYPTO
Herbert Xued58dd42008-03-04 14:29:21 -0800357 select CRYPTO_AUTHENC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 select CRYPTO_HMAC
359 select CRYPTO_MD5
Herbert Xu6b7326c2006-07-30 15:41:01 +1000360 select CRYPTO_CBC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 select CRYPTO_SHA1
362 select CRYPTO_DES
363 ---help---
364 Support for IPsec ESP.
365
366 If unsure, say Y.
367
368config INET_IPCOMP
369 tristate "IP: IPComp transformation"
Herbert Xud2acc342006-03-28 01:12:13 -0800370 select INET_XFRM_TUNNEL
Herbert Xu6fccab62008-07-25 02:54:40 -0700371 select XFRM_IPCOMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 ---help---
373 Support for IP Payload Compression Protocol (IPComp) (RFC3173),
374 typically needed for IPsec.
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -0800375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 If unsure, say Y.
377
Herbert Xud2acc342006-03-28 01:12:13 -0800378config INET_XFRM_TUNNEL
379 tristate
380 select INET_TUNNEL
381 default n
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383config INET_TUNNEL
Herbert Xud2acc342006-03-28 01:12:13 -0800384 tristate
385 default n
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Herbert Xub59f45d2006-05-27 23:05:54 -0700387config INET_XFRM_MODE_TRANSPORT
388 tristate "IP: IPsec transport mode"
389 default y
390 select XFRM
391 ---help---
392 Support for IPsec transport mode.
393
394 If unsure, say Y.
395
396config INET_XFRM_MODE_TUNNEL
397 tristate "IP: IPsec tunnel mode"
398 default y
399 select XFRM
400 ---help---
401 Support for IPsec tunnel mode.
402
403 If unsure, say Y.
404
Diego Beltrami0a694522006-10-03 23:47:05 -0700405config INET_XFRM_MODE_BEET
406 tristate "IP: IPsec BEET mode"
407 default y
408 select XFRM
409 ---help---
410 Support for IPsec BEET mode.
411
412 If unsure, say Y.
413
Jan-Bernd Themann71c87e02007-08-08 22:38:05 -0700414config INET_LRO
David S. Millere81963b2009-05-08 12:45:26 -0700415 bool "Large Receive Offload (ipv4/tcp)"
Frans Popbc8a5392009-05-18 21:48:38 -0700416 default y
Jan-Bernd Themann71c87e02007-08-08 22:38:05 -0700417 ---help---
418 Support for Large Receive Offload (ipv4/tcp).
419
420 If unsure, say Y.
421
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -0300422config INET_DIAG
423 tristate "INET: socket monitoring interface"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 default y
425 ---help---
Arnaldo Carvalho de Melo73c1f4a2005-08-12 12:51:49 -0300426 Support for INET (TCP, DCCP, etc) socket monitoring interface used by
427 native Linux tools such as ss. ss is included in iproute2, currently
Baruch Evenf4b94792007-02-21 19:32:37 -0800428 downloadable at <http://linux-net.osdl.org/index.php/Iproute2>.
Jesper Dangaard Brouera6e8f272009-02-22 00:07:13 -0800429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 If unsure, say Y.
431
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -0300432config INET_TCP_DIAG
433 depends on INET_DIAG
434 def_tristate INET_DIAG
435
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700436menuconfig TCP_CONG_ADVANCED
David S. Millera6484042005-06-24 18:07:51 -0700437 bool "TCP: advanced congestion control"
David S. Millera6484042005-06-24 18:07:51 -0700438 ---help---
439 Support for selection of various TCP congestion control
440 modules.
441
442 Nearly all users can safely say no here, and a safe default
Stephen Hemminger597811e2006-09-24 20:13:03 -0700443 selection will be made (CUBIC with new Reno as a fallback).
David S. Millera6484042005-06-24 18:07:51 -0700444
445 If unsure, say N.
446
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700447if TCP_CONG_ADVANCED
Stephen Hemminger83803032005-06-23 12:23:25 -0700448
449config TCP_CONG_BIC
450 tristate "Binary Increase Congestion (BIC) control"
Stephen Hemminger597811e2006-09-24 20:13:03 -0700451 default m
Stephen Hemminger83803032005-06-23 12:23:25 -0700452 ---help---
453 BIC-TCP is a sender-side only change that ensures a linear RTT
454 fairness under large windows while offering both scalability and
455 bounded TCP-friendliness. The protocol combines two schemes
456 called additive increase and binary search increase. When the
457 congestion window is large, additive increase with a large
458 increment ensures linear RTT fairness as well as good
459 scalability. Under small congestion windows, binary search
460 increase provides TCP friendliness.
461 See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
462
Stephen Hemmingerdf3271f2005-12-13 23:13:28 -0800463config TCP_CONG_CUBIC
464 tristate "CUBIC TCP"
Stephen Hemminger597811e2006-09-24 20:13:03 -0700465 default y
Stephen Hemmingerdf3271f2005-12-13 23:13:28 -0800466 ---help---
467 This is version 2.0 of BIC-TCP which uses a cubic growth function
468 among other techniques.
469 See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
470
Stephen Hemminger87270762005-06-23 12:24:09 -0700471config TCP_CONG_WESTWOOD
472 tristate "TCP Westwood+"
Stephen Hemminger87270762005-06-23 12:24:09 -0700473 default m
474 ---help---
475 TCP Westwood+ is a sender-side only modification of the TCP Reno
476 protocol stack that optimizes the performance of TCP congestion
477 control. It is based on end-to-end bandwidth estimation to set
478 congestion window and slow start threshold after a congestion
479 episode. Using this estimation, TCP Westwood+ adaptively sets a
480 slow start threshold and a congestion window which takes into
481 account the bandwidth used at the time congestion is experienced.
482 TCP Westwood+ significantly increases fairness wrt TCP Reno in
483 wired networks and throughput over wireless links.
484
Baruch Evena7868ea2005-06-23 12:28:11 -0700485config TCP_CONG_HTCP
486 tristate "H-TCP"
Baruch Evena7868ea2005-06-23 12:28:11 -0700487 default m
488 ---help---
489 H-TCP is a send-side only modifications of the TCP Reno
490 protocol stack that optimizes the performance of TCP
491 congestion control for high speed network links. It uses a
492 modeswitch to change the alpha and beta parameters of TCP Reno
493 based on network conditions and in a way so as to be fair with
494 other Reno and H-TCP flows.
495
John Heffnera628d292005-06-23 12:24:58 -0700496config TCP_CONG_HSTCP
497 tristate "High Speed TCP"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700498 depends on EXPERIMENTAL
John Heffnera628d292005-06-23 12:24:58 -0700499 default n
500 ---help---
501 Sally Floyd's High Speed TCP (RFC 3649) congestion control.
502 A modification to TCP's congestion control mechanism for use
503 with large congestion windows. A table indicates how much to
504 increase the congestion window by when an ACK is received.
505 For more detail see http://www.icir.org/floyd/hstcp.html
506
Daniele Lacamera835b3f02005-06-23 12:26:34 -0700507config TCP_CONG_HYBLA
508 tristate "TCP-Hybla congestion control algorithm"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700509 depends on EXPERIMENTAL
Daniele Lacamera835b3f02005-06-23 12:26:34 -0700510 default n
511 ---help---
512 TCP-Hybla is a sender-side only change that eliminates penalization of
513 long-RTT, large-bandwidth connections, like when satellite legs are
Matt LaPlante44c09202006-10-03 22:34:14 +0200514 involved, especially when sharing a common bottleneck with normal
Daniele Lacamera835b3f02005-06-23 12:26:34 -0700515 terrestrial connections.
516
Stephen Hemmingerb87d8562005-06-23 12:27:19 -0700517config TCP_CONG_VEGAS
518 tristate "TCP Vegas"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700519 depends on EXPERIMENTAL
Stephen Hemmingerb87d8562005-06-23 12:27:19 -0700520 default n
521 ---help---
522 TCP Vegas is a sender-side only change to TCP that anticipates
523 the onset of congestion by estimating the bandwidth. TCP Vegas
524 adjusts the sending rate by modifying the congestion
525 window. TCP Vegas should provide less packet loss, but it is
526 not as aggressive as TCP Reno.
527
John Heffner0e579762005-06-23 12:29:07 -0700528config TCP_CONG_SCALABLE
529 tristate "Scalable TCP"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700530 depends on EXPERIMENTAL
John Heffner0e579762005-06-23 12:29:07 -0700531 default n
532 ---help---
533 Scalable TCP is a sender-side only change to TCP which uses a
534 MIMD congestion control algorithm which has some nice scaling
535 properties, though is known to have fairness issues.
Baruch Evenf4b94792007-02-21 19:32:37 -0800536 See http://www.deneholme.net/tom/scalable/
Baruch Evena7868ea2005-06-23 12:28:11 -0700537
Wong Hoi Sing Edison7c106d72006-06-05 17:27:58 -0700538config TCP_CONG_LP
539 tristate "TCP Low Priority"
540 depends on EXPERIMENTAL
541 default n
542 ---help---
543 TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
Matt LaPlantecab00892006-10-03 22:36:44 +0200544 to utilize only the excess network bandwidth as compared to the
Wong Hoi Sing Edison7c106d72006-06-05 17:27:58 -0700545 ``fair share`` of bandwidth as targeted by TCP.
546 See http://www-ece.rice.edu/networks/TCP-LP/
547
Bin Zhou76f10172006-06-05 17:28:30 -0700548config TCP_CONG_VENO
549 tristate "TCP Veno"
550 depends on EXPERIMENTAL
551 default n
552 ---help---
553 TCP Veno is a sender-side only enhancement of TCP to obtain better
554 throughput over wireless networks. TCP Veno makes use of state
555 distinguishing to circumvent the difficult judgment of the packet loss
556 type. TCP Veno cuts down less congestion window in response to random
557 loss packets.
558 See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
559
Angelo P. Castellani5ef81472007-02-22 00:23:05 -0800560config TCP_CONG_YEAH
561 tristate "YeAH TCP"
562 depends on EXPERIMENTAL
David S. Miller2ff011e2007-05-17 00:07:47 -0700563 select TCP_CONG_VEGAS
Angelo P. Castellani5ef81472007-02-22 00:23:05 -0800564 default n
565 ---help---
566 YeAH-TCP is a sender-side high-speed enabled TCP congestion control
567 algorithm, which uses a mixed loss/delay approach to compute the
568 congestion window. It's design goals target high efficiency,
569 internal, RTT and Reno fairness, resilience to link loss while
570 keeping network elements load as low as possible.
571
572 For further details look here:
573 http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf
574
Stephen Hemmingerc4622382007-04-20 17:07:51 -0700575config TCP_CONG_ILLINOIS
576 tristate "TCP Illinois"
577 depends on EXPERIMENTAL
578 default n
579 ---help---
Matt LaPlante01dd2fb2007-10-20 01:34:40 +0200580 TCP-Illinois is a sender-side modification of TCP Reno for
Stephen Hemmingerc4622382007-04-20 17:07:51 -0700581 high speed long delay links. It uses round-trip-time to
582 adjust the alpha and beta parameters to achieve a higher average
583 throughput and maintain fairness.
584
585 For further details see:
586 http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html
587
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700588choice
589 prompt "Default TCP congestion control"
Stephen Hemminger597811e2006-09-24 20:13:03 -0700590 default DEFAULT_CUBIC
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700591 help
592 Select the TCP congestion control that will be used by default
593 for all connections.
594
595 config DEFAULT_BIC
596 bool "Bic" if TCP_CONG_BIC=y
597
598 config DEFAULT_CUBIC
599 bool "Cubic" if TCP_CONG_CUBIC=y
600
601 config DEFAULT_HTCP
602 bool "Htcp" if TCP_CONG_HTCP=y
603
Jan Engelhardtdd2acaa2010-03-11 09:57:27 +0000604 config DEFAULT_HYBLA
605 bool "Hybla" if TCP_CONG_HYBLA=y
606
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700607 config DEFAULT_VEGAS
608 bool "Vegas" if TCP_CONG_VEGAS=y
609
Jan Engelhardt6ce1a6d2010-03-11 09:57:28 +0000610 config DEFAULT_VENO
611 bool "Veno" if TCP_CONG_VENO=y
612
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700613 config DEFAULT_WESTWOOD
614 bool "Westwood" if TCP_CONG_WESTWOOD=y
615
616 config DEFAULT_RENO
617 bool "Reno"
618
619endchoice
620
621endif
Stephen Hemminger83803032005-06-23 12:23:25 -0700622
Stephen Hemminger597811e2006-09-24 20:13:03 -0700623config TCP_CONG_CUBIC
David S. Miller6c360762005-06-26 15:20:20 -0700624 tristate
David S. Millera6484042005-06-24 18:07:51 -0700625 depends on !TCP_CONG_ADVANCED
626 default y
627
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700628config DEFAULT_TCP_CONG
629 string
630 default "bic" if DEFAULT_BIC
631 default "cubic" if DEFAULT_CUBIC
632 default "htcp" if DEFAULT_HTCP
Jan Engelhardtdd2acaa2010-03-11 09:57:27 +0000633 default "hybla" if DEFAULT_HYBLA
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700634 default "vegas" if DEFAULT_VEGAS
635 default "westwood" if DEFAULT_WESTWOOD
Jan Engelhardt6ce1a6d2010-03-11 09:57:28 +0000636 default "veno" if DEFAULT_VENO
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700637 default "reno" if DEFAULT_RENO
Stephen Hemminger597811e2006-09-24 20:13:03 -0700638 default "cubic"
Stephen Hemminger3d2573f2006-09-24 20:11:58 -0700639
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800640config TCP_MD5SIG
641 bool "TCP: MD5 Signature Option support (RFC2385) (EXPERIMENTAL)"
642 depends on EXPERIMENTAL
643 select CRYPTO
644 select CRYPTO_MD5
645 ---help---
David Sterba3dde6ad2007-05-09 07:12:20 +0200646 RFC2385 specifies a method of giving MD5 protection to TCP sessions.
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800647 Its main (only?) use is to protect BGP sessions between core routers
648 on the Internet.
649
650 If unsure, say N.
651