Commit | Line | Data |
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1da177e4 LT |
1 | # |
2 | # IP configuration | |
3 | # | |
19baf839 | 4 | choice |
b5354207 | 5 | prompt "Choose IP: FIB lookup" |
19baf839 RO |
6 | depends on INET |
7 | default IP_FIB_HASH | |
8 | ||
9 | config IP_FIB_HASH | |
10 | bool "FIB_HASH" | |
11 | ---help--- | |
12 | Current FIB is very proven and good enough for most users. | |
13 | ||
14 | config IP_FIB_TRIE | |
15 | bool "FIB_TRIE" | |
16 | ---help--- | |
17 | Use new experimental LC-trie as FIB lookup algoritm. | |
18 | This improves lookup performance | |
19 | ||
20 | LC-trie is described in: | |
21 | ||
22 | IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson | |
23 | IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999 | |
24 | An experimental study of compression methods for dynamic tries | |
25 | Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002. | |
26 | http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/ | |
27 | ||
28 | endchoice | |
29 | ||
1da177e4 LT |
30 | config IP_MULTICAST |
31 | bool "IP: multicasting" | |
32 | depends on INET | |
33 | help | |
34 | This is code for addressing several networked computers at once, | |
35 | enlarging your kernel by about 2 KB. You need multicasting if you | |
36 | intend to participate in the MBONE, a high bandwidth network on top | |
37 | of the Internet which carries audio and video broadcasts. More | |
38 | information about the MBONE is on the WWW at | |
39 | <http://www-itg.lbl.gov/mbone/>. Information about the multicast | |
40 | capabilities of the various network cards is contained in | |
41 | <file:Documentation/networking/multicast.txt>. For most people, it's | |
42 | safe to say N. | |
43 | ||
44 | config IP_ADVANCED_ROUTER | |
45 | bool "IP: advanced router" | |
46 | depends on INET | |
47 | ---help--- | |
48 | If you intend to run your Linux box mostly as a router, i.e. as a | |
49 | computer that forwards and redistributes network packets, say Y; you | |
50 | will then be presented with several options that allow more precise | |
51 | control about the routing process. | |
52 | ||
53 | The answer to this question won't directly affect the kernel: | |
54 | answering N will just cause the configurator to skip all the | |
55 | questions about advanced routing. | |
56 | ||
57 | Note that your box can only act as a router if you enable IP | |
58 | forwarding in your kernel; you can do that by saying Y to "/proc | |
59 | file system support" and "Sysctl support" below and executing the | |
60 | line | |
61 | ||
62 | echo "1" > /proc/sys/net/ipv4/ip_forward | |
63 | ||
64 | at boot time after the /proc file system has been mounted. | |
65 | ||
66 | If you turn on IP forwarding, you will also get the rp_filter, which | |
67 | automatically rejects incoming packets if the routing table entry | |
68 | for their source address doesn't match the network interface they're | |
69 | arriving on. This has security advantages because it prevents the | |
70 | so-called IP spoofing, however it can pose problems if you use | |
71 | asymmetric routing (packets from you to a host take a different path | |
72 | than packets from that host to you) or if you operate a non-routing | |
73 | host which has several IP addresses on different interfaces. To turn | |
74 | rp_filter off use: | |
75 | ||
76 | echo 0 > /proc/sys/net/ipv4/conf/<device>/rp_filter | |
77 | or | |
78 | echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter | |
79 | ||
80 | If unsure, say N here. | |
81 | ||
82 | config IP_MULTIPLE_TABLES | |
83 | bool "IP: policy routing" | |
84 | depends on IP_ADVANCED_ROUTER | |
85 | ---help--- | |
86 | Normally, a router decides what to do with a received packet based | |
87 | solely on the packet's final destination address. If you say Y here, | |
88 | the Linux router will also be able to take the packet's source | |
89 | address into account. Furthermore, the TOS (Type-Of-Service) field | |
90 | of the packet can be used for routing decisions as well. | |
91 | ||
92 | If you are interested in this, please see the preliminary | |
93 | documentation at <http://www.compendium.com.ar/policy-routing.txt> | |
94 | and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>. | |
95 | You will need supporting software from | |
96 | <ftp://ftp.tux.org/pub/net/ip-routing/>. | |
97 | ||
98 | If unsure, say N. | |
99 | ||
100 | config IP_ROUTE_FWMARK | |
101 | bool "IP: use netfilter MARK value as routing key" | |
102 | depends on IP_MULTIPLE_TABLES && NETFILTER | |
103 | help | |
104 | If you say Y here, you will be able to specify different routes for | |
105 | packets with different mark values (see iptables(8), MARK target). | |
106 | ||
107 | config IP_ROUTE_MULTIPATH | |
108 | bool "IP: equal cost multipath" | |
109 | depends on IP_ADVANCED_ROUTER | |
110 | help | |
111 | Normally, the routing tables specify a single action to be taken in | |
112 | a deterministic manner for a given packet. If you say Y here | |
113 | however, it becomes possible to attach several actions to a packet | |
114 | pattern, in effect specifying several alternative paths to travel | |
115 | for those packets. The router considers all these paths to be of | |
116 | equal "cost" and chooses one of them in a non-deterministic fashion | |
117 | if a matching packet arrives. | |
118 | ||
119 | config IP_ROUTE_MULTIPATH_CACHED | |
120 | bool "IP: equal cost multipath with caching support (EXPERIMENTAL)" | |
121 | depends on: IP_ROUTE_MULTIPATH | |
122 | help | |
123 | Normally, equal cost multipath routing is not supported by the | |
124 | routing cache. If you say Y here, alternative routes are cached | |
125 | and on cache lookup a route is chosen in a configurable fashion. | |
126 | ||
127 | If unsure, say N. | |
128 | ||
129 | config IP_ROUTE_MULTIPATH_RR | |
130 | tristate "MULTIPATH: round robin algorithm" | |
131 | depends on IP_ROUTE_MULTIPATH_CACHED | |
132 | help | |
133 | Mulitpath routes are chosen according to Round Robin | |
134 | ||
135 | config IP_ROUTE_MULTIPATH_RANDOM | |
136 | tristate "MULTIPATH: random algorithm" | |
137 | depends on IP_ROUTE_MULTIPATH_CACHED | |
138 | help | |
139 | Multipath routes are chosen in a random fashion. Actually, | |
140 | there is no weight for a route. The advantage of this policy | |
141 | is that it is implemented stateless and therefore introduces only | |
142 | a very small delay. | |
143 | ||
144 | config IP_ROUTE_MULTIPATH_WRANDOM | |
145 | tristate "MULTIPATH: weighted random algorithm" | |
146 | depends on IP_ROUTE_MULTIPATH_CACHED | |
147 | help | |
148 | Multipath routes are chosen in a weighted random fashion. | |
149 | The per route weights are the weights visible via ip route 2. As the | |
150 | corresponding state management introduces some overhead routing delay | |
151 | is increased. | |
152 | ||
153 | config IP_ROUTE_MULTIPATH_DRR | |
154 | tristate "MULTIPATH: interface round robin algorithm" | |
155 | depends on IP_ROUTE_MULTIPATH_CACHED | |
156 | help | |
157 | Connections are distributed in a round robin fashion over the | |
158 | available interfaces. This policy makes sense if the connections | |
159 | should be primarily distributed on interfaces and not on routes. | |
160 | ||
161 | config IP_ROUTE_VERBOSE | |
162 | bool "IP: verbose route monitoring" | |
163 | depends on IP_ADVANCED_ROUTER | |
164 | help | |
165 | If you say Y here, which is recommended, then the kernel will print | |
166 | verbose messages regarding the routing, for example warnings about | |
167 | received packets which look strange and could be evidence of an | |
168 | attack or a misconfigured system somewhere. The information is | |
169 | handled by the klogd daemon which is responsible for kernel messages | |
170 | ("man klogd"). | |
171 | ||
172 | config IP_PNP | |
173 | bool "IP: kernel level autoconfiguration" | |
174 | depends on INET | |
175 | help | |
176 | This enables automatic configuration of IP addresses of devices and | |
177 | of the routing table during kernel boot, based on either information | |
178 | supplied on the kernel command line or by BOOTP or RARP protocols. | |
179 | You need to say Y only for diskless machines requiring network | |
180 | access to boot (in which case you want to say Y to "Root file system | |
181 | on NFS" as well), because all other machines configure the network | |
182 | in their startup scripts. | |
183 | ||
184 | config IP_PNP_DHCP | |
185 | bool "IP: DHCP support" | |
186 | depends on IP_PNP | |
187 | ---help--- | |
188 | If you want your Linux box to mount its whole root file system (the | |
189 | one containing the directory /) from some other computer over the | |
190 | net via NFS and you want the IP address of your computer to be | |
191 | discovered automatically at boot time using the DHCP protocol (a | |
192 | special protocol designed for doing this job), say Y here. In case | |
193 | the boot ROM of your network card was designed for booting Linux and | |
194 | does DHCP itself, providing all necessary information on the kernel | |
195 | command line, you can say N here. | |
196 | ||
197 | If unsure, say Y. Note that if you want to use DHCP, a DHCP server | |
198 | must be operating on your network. Read | |
199 | <file:Documentation/nfsroot.txt> for details. | |
200 | ||
201 | config IP_PNP_BOOTP | |
202 | bool "IP: BOOTP support" | |
203 | depends on IP_PNP | |
204 | ---help--- | |
205 | If you want your Linux box to mount its whole root file system (the | |
206 | one containing the directory /) from some other computer over the | |
207 | net via NFS and you want the IP address of your computer to be | |
208 | discovered automatically at boot time using the BOOTP protocol (a | |
209 | special protocol designed for doing this job), say Y here. In case | |
210 | the boot ROM of your network card was designed for booting Linux and | |
211 | does BOOTP itself, providing all necessary information on the kernel | |
212 | command line, you can say N here. If unsure, say Y. Note that if you | |
213 | want to use BOOTP, a BOOTP server must be operating on your network. | |
214 | Read <file:Documentation/nfsroot.txt> for details. | |
215 | ||
216 | config IP_PNP_RARP | |
217 | bool "IP: RARP support" | |
218 | depends on IP_PNP | |
219 | help | |
220 | If you want your Linux box to mount its whole root file system (the | |
221 | one containing the directory /) from some other computer over the | |
222 | net via NFS and you want the IP address of your computer to be | |
223 | discovered automatically at boot time using the RARP protocol (an | |
224 | older protocol which is being obsoleted by BOOTP and DHCP), say Y | |
225 | here. Note that if you want to use RARP, a RARP server must be | |
226 | operating on your network. Read <file:Documentation/nfsroot.txt> for | |
227 | details. | |
228 | ||
229 | # not yet ready.. | |
230 | # bool ' IP: ARP support' CONFIG_IP_PNP_ARP | |
231 | config NET_IPIP | |
232 | tristate "IP: tunneling" | |
233 | depends on INET | |
234 | select INET_TUNNEL | |
235 | ---help--- | |
236 | Tunneling means encapsulating data of one protocol type within | |
237 | another protocol and sending it over a channel that understands the | |
238 | encapsulating protocol. This particular tunneling driver implements | |
239 | encapsulation of IP within IP, which sounds kind of pointless, but | |
240 | can be useful if you want to make your (or some other) machine | |
241 | appear on a different network than it physically is, or to use | |
242 | mobile-IP facilities (allowing laptops to seamlessly move between | |
243 | networks without changing their IP addresses). | |
244 | ||
245 | Saying Y to this option will produce two modules ( = code which can | |
246 | be inserted in and removed from the running kernel whenever you | |
247 | want). Most people won't need this and can say N. | |
248 | ||
249 | config NET_IPGRE | |
250 | tristate "IP: GRE tunnels over IP" | |
251 | depends on INET | |
252 | select XFRM | |
253 | help | |
254 | Tunneling means encapsulating data of one protocol type within | |
255 | another protocol and sending it over a channel that understands the | |
256 | encapsulating protocol. This particular tunneling driver implements | |
257 | GRE (Generic Routing Encapsulation) and at this time allows | |
258 | encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. | |
259 | This driver is useful if the other endpoint is a Cisco router: Cisco | |
260 | likes GRE much better than the other Linux tunneling driver ("IP | |
261 | tunneling" above). In addition, GRE allows multicast redistribution | |
262 | through the tunnel. | |
263 | ||
264 | config NET_IPGRE_BROADCAST | |
265 | bool "IP: broadcast GRE over IP" | |
266 | depends on IP_MULTICAST && NET_IPGRE | |
267 | help | |
268 | One application of GRE/IP is to construct a broadcast WAN (Wide Area | |
269 | Network), which looks like a normal Ethernet LAN (Local Area | |
270 | Network), but can be distributed all over the Internet. If you want | |
271 | to do that, say Y here and to "IP multicast routing" below. | |
272 | ||
273 | config IP_MROUTE | |
274 | bool "IP: multicast routing" | |
275 | depends on IP_MULTICAST | |
276 | help | |
277 | This is used if you want your machine to act as a router for IP | |
278 | packets that have several destination addresses. It is needed on the | |
279 | MBONE, a high bandwidth network on top of the Internet which carries | |
280 | audio and video broadcasts. In order to do that, you would most | |
281 | likely run the program mrouted. Information about the multicast | |
282 | capabilities of the various network cards is contained in | |
283 | <file:Documentation/networking/multicast.txt>. If you haven't heard | |
284 | about it, you don't need it. | |
285 | ||
286 | config IP_PIMSM_V1 | |
287 | bool "IP: PIM-SM version 1 support" | |
288 | depends on IP_MROUTE | |
289 | help | |
290 | Kernel side support for Sparse Mode PIM (Protocol Independent | |
291 | Multicast) version 1. This multicast routing protocol is used widely | |
292 | because Cisco supports it. You need special software to use it | |
293 | (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more | |
294 | information about PIM. | |
295 | ||
296 | Say Y if you want to use PIM-SM v1. Note that you can say N here if | |
297 | you just want to use Dense Mode PIM. | |
298 | ||
299 | config IP_PIMSM_V2 | |
300 | bool "IP: PIM-SM version 2 support" | |
301 | depends on IP_MROUTE | |
302 | help | |
303 | Kernel side support for Sparse Mode PIM version 2. In order to use | |
304 | this, you need an experimental routing daemon supporting it (pimd or | |
305 | gated-5). This routing protocol is not used widely, so say N unless | |
306 | you want to play with it. | |
307 | ||
308 | config ARPD | |
309 | bool "IP: ARP daemon support (EXPERIMENTAL)" | |
310 | depends on INET && EXPERIMENTAL | |
311 | ---help--- | |
312 | Normally, the kernel maintains an internal cache which maps IP | |
313 | addresses to hardware addresses on the local network, so that | |
314 | Ethernet/Token Ring/ etc. frames are sent to the proper address on | |
315 | the physical networking layer. For small networks having a few | |
316 | hundred directly connected hosts or less, keeping this address | |
317 | resolution (ARP) cache inside the kernel works well. However, | |
318 | maintaining an internal ARP cache does not work well for very large | |
319 | switched networks, and will use a lot of kernel memory if TCP/IP | |
320 | connections are made to many machines on the network. | |
321 | ||
322 | If you say Y here, the kernel's internal ARP cache will never grow | |
323 | to more than 256 entries (the oldest entries are expired in a LIFO | |
324 | manner) and communication will be attempted with the user space ARP | |
325 | daemon arpd. Arpd then answers the address resolution request either | |
326 | from its own cache or by asking the net. | |
327 | ||
328 | This code is experimental and also obsolete. If you want to use it, | |
329 | you need to find a version of the daemon arpd on the net somewhere, | |
330 | and you should also say Y to "Kernel/User network link driver", | |
331 | below. If unsure, say N. | |
332 | ||
333 | config SYN_COOKIES | |
334 | bool "IP: TCP syncookie support (disabled per default)" | |
335 | depends on INET | |
336 | ---help--- | |
337 | Normal TCP/IP networking is open to an attack known as "SYN | |
338 | flooding". This denial-of-service attack prevents legitimate remote | |
339 | users from being able to connect to your computer during an ongoing | |
340 | attack and requires very little work from the attacker, who can | |
341 | operate from anywhere on the Internet. | |
342 | ||
343 | SYN cookies provide protection against this type of attack. If you | |
344 | say Y here, the TCP/IP stack will use a cryptographic challenge | |
345 | protocol known as "SYN cookies" to enable legitimate users to | |
346 | continue to connect, even when your machine is under attack. There | |
347 | is no need for the legitimate users to change their TCP/IP software; | |
348 | SYN cookies work transparently to them. For technical information | |
349 | about SYN cookies, check out <http://cr.yp.to/syncookies.html>. | |
350 | ||
351 | If you are SYN flooded, the source address reported by the kernel is | |
352 | likely to have been forged by the attacker; it is only reported as | |
353 | an aid in tracing the packets to their actual source and should not | |
354 | be taken as absolute truth. | |
355 | ||
356 | SYN cookies may prevent correct error reporting on clients when the | |
357 | server is really overloaded. If this happens frequently better turn | |
358 | them off. | |
359 | ||
360 | If you say Y here, note that SYN cookies aren't enabled by default; | |
361 | you can enable them by saying Y to "/proc file system support" and | |
362 | "Sysctl support" below and executing the command | |
363 | ||
364 | echo 1 >/proc/sys/net/ipv4/tcp_syncookies | |
365 | ||
366 | at boot time after the /proc file system has been mounted. | |
367 | ||
368 | If unsure, say N. | |
369 | ||
370 | config INET_AH | |
371 | tristate "IP: AH transformation" | |
372 | depends on INET | |
373 | select XFRM | |
374 | select CRYPTO | |
375 | select CRYPTO_HMAC | |
376 | select CRYPTO_MD5 | |
377 | select CRYPTO_SHA1 | |
378 | ---help--- | |
379 | Support for IPsec AH. | |
380 | ||
381 | If unsure, say Y. | |
382 | ||
383 | config INET_ESP | |
384 | tristate "IP: ESP transformation" | |
385 | depends on INET | |
386 | select XFRM | |
387 | select CRYPTO | |
388 | select CRYPTO_HMAC | |
389 | select CRYPTO_MD5 | |
390 | select CRYPTO_SHA1 | |
391 | select CRYPTO_DES | |
392 | ---help--- | |
393 | Support for IPsec ESP. | |
394 | ||
395 | If unsure, say Y. | |
396 | ||
397 | config INET_IPCOMP | |
398 | tristate "IP: IPComp transformation" | |
399 | depends on INET | |
400 | select XFRM | |
401 | select INET_TUNNEL | |
402 | select CRYPTO | |
403 | select CRYPTO_DEFLATE | |
404 | ---help--- | |
405 | Support for IP Payload Compression Protocol (IPComp) (RFC3173), | |
406 | typically needed for IPsec. | |
407 | ||
408 | If unsure, say Y. | |
409 | ||
410 | config INET_TUNNEL | |
411 | tristate "IP: tunnel transformation" | |
412 | depends on INET | |
413 | select XFRM | |
414 | ---help--- | |
415 | Support for generic IP tunnel transformation, which is required by | |
416 | the IP tunneling module as well as tunnel mode IPComp. | |
417 | ||
418 | If unsure, say Y. | |
419 | ||
420 | config IP_TCPDIAG | |
421 | tristate "IP: TCP socket monitoring interface" | |
422 | depends on INET | |
423 | default y | |
424 | ---help--- | |
425 | Support for TCP socket monitoring interface used by native Linux | |
426 | tools such as ss. ss is included in iproute2, currently downloadable | |
427 | at <http://developer.osdl.org/dev/iproute2>. If you want IPv6 support | |
428 | and have selected IPv6 as a module, you need to build this as a | |
429 | module too. | |
430 | ||
431 | If unsure, say Y. | |
432 | ||
433 | config IP_TCPDIAG_IPV6 | |
434 | def_bool (IP_TCPDIAG=y && IPV6=y) || (IP_TCPDIAG=m && IPV6) | |
435 | ||
83803034 SH |
436 | # TCP Reno is builtin (required as fallback) |
437 | menu "TCP congestion control" | |
438 | depends on INET | |
439 | ||
440 | config TCP_CONG_BIC | |
441 | tristate "Binary Increase Congestion (BIC) control" | |
442 | depends on INET | |
443 | default y | |
444 | ---help--- | |
445 | BIC-TCP is a sender-side only change that ensures a linear RTT | |
446 | fairness under large windows while offering both scalability and | |
447 | bounded TCP-friendliness. The protocol combines two schemes | |
448 | called additive increase and binary search increase. When the | |
449 | congestion window is large, additive increase with a large | |
450 | increment ensures linear RTT fairness as well as good | |
451 | scalability. Under small congestion windows, binary search | |
452 | increase provides TCP friendliness. | |
453 | See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/ | |
454 | ||
87270762 SH |
455 | config TCP_CONG_WESTWOOD |
456 | tristate "TCP Westwood+" | |
457 | depends on INET | |
458 | default m | |
459 | ---help--- | |
460 | TCP Westwood+ is a sender-side only modification of the TCP Reno | |
461 | protocol stack that optimizes the performance of TCP congestion | |
462 | control. It is based on end-to-end bandwidth estimation to set | |
463 | congestion window and slow start threshold after a congestion | |
464 | episode. Using this estimation, TCP Westwood+ adaptively sets a | |
465 | slow start threshold and a congestion window which takes into | |
466 | account the bandwidth used at the time congestion is experienced. | |
467 | TCP Westwood+ significantly increases fairness wrt TCP Reno in | |
468 | wired networks and throughput over wireless links. | |
469 | ||
a7868ea6 BE |
470 | config TCP_CONG_HTCP |
471 | tristate "H-TCP" | |
472 | depends on INET | |
473 | default m | |
474 | ---help--- | |
475 | H-TCP is a send-side only modifications of the TCP Reno | |
476 | protocol stack that optimizes the performance of TCP | |
477 | congestion control for high speed network links. It uses a | |
478 | modeswitch to change the alpha and beta parameters of TCP Reno | |
479 | based on network conditions and in a way so as to be fair with | |
480 | other Reno and H-TCP flows. | |
481 | ||
a628d29b JH |
482 | config TCP_CONG_HSTCP |
483 | tristate "High Speed TCP" | |
484 | depends on INET && EXPERIMENTAL | |
485 | default n | |
486 | ---help--- | |
487 | Sally Floyd's High Speed TCP (RFC 3649) congestion control. | |
488 | A modification to TCP's congestion control mechanism for use | |
489 | with large congestion windows. A table indicates how much to | |
490 | increase the congestion window by when an ACK is received. | |
491 | For more detail see http://www.icir.org/floyd/hstcp.html | |
492 | ||
835b3f0c DL |
493 | config TCP_CONG_HYBLA |
494 | tristate "TCP-Hybla congestion control algorithm" | |
495 | depends on INET && EXPERIMENTAL | |
496 | default n | |
497 | ---help--- | |
498 | TCP-Hybla is a sender-side only change that eliminates penalization of | |
499 | long-RTT, large-bandwidth connections, like when satellite legs are | |
500 | involved, expecially when sharing a common bottleneck with normal | |
501 | terrestrial connections. | |
502 | ||
b87d8561 SH |
503 | config TCP_CONG_VEGAS |
504 | tristate "TCP Vegas" | |
505 | depends on INET && EXPERIMENTAL | |
506 | default n | |
507 | ---help--- | |
508 | TCP Vegas is a sender-side only change to TCP that anticipates | |
509 | the onset of congestion by estimating the bandwidth. TCP Vegas | |
510 | adjusts the sending rate by modifying the congestion | |
511 | window. TCP Vegas should provide less packet loss, but it is | |
512 | not as aggressive as TCP Reno. | |
513 | ||
a7868ea6 | 514 | |
83803034 SH |
515 | endmenu |
516 | ||
1da177e4 LT |
517 | source "net/ipv4/ipvs/Kconfig" |
518 |