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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# Network configuration
3#
4
Sam Ravnborgd5950b42005-07-11 21:03:49 -07005menu "Networking"
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7config NET
8 bool "Networking support"
9 ---help---
10 Unless you really know what you are doing, you should say Y here.
11 The reason is that some programs need kernel networking support even
12 when running on a stand-alone machine that isn't connected to any
Sam Ravnborgd5950b42005-07-11 21:03:49 -070013 other computer.
14
15 If you are upgrading from an older kernel, you
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 should consider updating your networking tools too because changes
17 in the kernel and the tools often go hand in hand. The tools are
18 contained in the package net-tools, the location and version number
19 of which are given in <file:Documentation/Changes>.
20
21 For a general introduction to Linux networking, it is highly
22 recommended to read the NET-HOWTO, available from
23 <http://www.tldp.org/docs.html#howto>.
24
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -070025# Make sure that all config symbols are dependent on NET
26if NET
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028menu "Networking options"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Stephen Hemminger0dec4562006-02-02 20:40:09 -080030config NETDEBUG
31 bool "Network packet debugging"
32 help
33 You can say Y here if you want to get additional messages useful in
34 debugging bad packets, but can overwhelm logs under denial of service
35 attacks.
36
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -070037source "net/packet/Kconfig"
38source "net/unix/Kconfig"
39source "net/xfrm/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41config INET
42 bool "TCP/IP networking"
43 ---help---
44 These are the protocols used on the Internet and on most local
45 Ethernets. It is highly recommended to say Y here (this will enlarge
46 your kernel by about 144 KB), since some programs (e.g. the X window
47 system) use TCP/IP even if your machine is not connected to any
48 other computer. You will get the so-called loopback device which
49 allows you to ping yourself (great fun, that!).
50
51 For an excellent introduction to Linux networking, please read the
52 Linux Networking HOWTO, available from
53 <http://www.tldp.org/docs.html#howto>.
54
55 If you say Y here and also to "/proc file system support" and
56 "Sysctl support" below, you can change various aspects of the
57 behavior of the TCP/IP code by writing to the (virtual) files in
58 /proc/sys/net/ipv4/*; the options are explained in the file
59 <file:Documentation/networking/ip-sysctl.txt>.
60
61 Short answer: say Y.
62
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -070063if INET
Linus Torvalds1da177e2005-04-16 15:20:36 -070064source "net/ipv4/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -070065source "net/ipv6/Kconfig"
66
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -070067endif # if INET
68
James Morris984bc162006-06-09 00:29:17 -070069config NETWORK_SECMARK
70 bool "Security Marking"
71 help
72 This enables security marking of network packets, similar
73 to nfmark, but designated for security purposes.
74 If you are unsure how to answer this question, answer N.
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076menuconfig NETFILTER
77 bool "Network packet filtering (replaces ipchains)"
78 ---help---
79 Netfilter is a framework for filtering and mangling network packets
80 that pass through your Linux box.
81
82 The most common use of packet filtering is to run your Linux box as
83 a firewall protecting a local network from the Internet. The type of
84 firewall provided by this kernel support is called a "packet
85 filter", which means that it can reject individual network packets
86 based on type, source, destination etc. The other kind of firewall,
87 a "proxy-based" one, is more secure but more intrusive and more
88 bothersome to set up; it inspects the network traffic much more
89 closely, modifies it and has knowledge about the higher level
90 protocols, which a packet filter lacks. Moreover, proxy-based
91 firewalls often require changes to the programs running on the local
92 clients. Proxy-based firewalls don't need support by the kernel, but
93 they are often combined with a packet filter, which only works if
94 you say Y here.
95
96 You should also say Y here if you intend to use your Linux box as
97 the gateway to the Internet for a local network of machines without
98 globally valid IP addresses. This is called "masquerading": if one
99 of the computers on your local network wants to send something to
100 the outside, your box can "masquerade" as that computer, i.e. it
101 forwards the traffic to the intended outside destination, but
102 modifies the packets to make it look like they came from the
103 firewall box itself. It works both ways: if the outside host
104 replies, the Linux box will silently forward the traffic to the
105 correct local computer. This way, the computers on your local net
106 are completely invisible to the outside world, even though they can
107 reach the outside and can receive replies. It is even possible to
108 run globally visible servers from within a masqueraded local network
109 using a mechanism called portforwarding. Masquerading is also often
110 called NAT (Network Address Translation).
111
112 Another use of Netfilter is in transparent proxying: if a machine on
113 the local network tries to connect to an outside host, your Linux
114 box can transparently forward the traffic to a local server,
115 typically a caching proxy server.
116
117 Yet another use of Netfilter is building a bridging firewall. Using
118 a bridge with Network packet filtering enabled makes iptables "see"
119 the bridged traffic. For filtering on the lower network and Ethernet
120 protocols over the bridge, use ebtables (under bridge netfilter
121 configuration).
122
123 Various modules exist for netfilter which replace the previous
124 masquerading (ipmasqadm), packet filtering (ipchains), transparent
125 proxying, and portforwarding mechanisms. Please see
126 <file:Documentation/Changes> under "iptables" for the location of
127 these packages.
128
129 Make sure to say N to "Fast switching" below if you intend to say Y
130 here, as Fast switching currently bypasses netfilter.
131
132 Chances are that you should say Y here if you compile a kernel which
133 will run as a router and N for regular hosts. If unsure, say N.
134
135if NETFILTER
136
137config NETFILTER_DEBUG
138 bool "Network packet filtering debugging"
139 depends on NETFILTER
140 help
141 You can say Y here if you want to get additional messages useful in
142 debugging the netfilter code.
143
144config BRIDGE_NETFILTER
145 bool "Bridged IP/ARP packets filtering"
146 depends on BRIDGE && NETFILTER && INET
147 default y
148 ---help---
149 Enabling this option will let arptables resp. iptables see bridged
150 ARP resp. IP traffic. If you want a bridging firewall, you probably
151 want this option enabled.
152 Enabling or disabling this option doesn't enable or disable
153 ebtables.
154
155 If unsure, say N.
156
Harald Welte9eb0eec2005-09-17 00:41:21 -0700157source "net/netfilter/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158source "net/ipv4/netfilter/Kconfig"
159source "net/ipv6/netfilter/Kconfig"
160source "net/decnet/netfilter/Kconfig"
161source "net/bridge/netfilter/Kconfig"
162
163endif
164
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700165source "net/dccp/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166source "net/sctp/Kconfig"
Per Liden1e63e682006-01-16 16:39:13 +0100167source "net/tipc/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700168source "net/atm/Kconfig"
169source "net/bridge/Kconfig"
170source "net/8021q/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171source "net/decnet/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172source "net/llc/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173source "net/ipx/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174source "drivers/net/appletalk/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700175source "net/x25/Kconfig"
176source "net/lapb/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178config NET_DIVERT
179 bool "Frame Diverter (EXPERIMENTAL)"
Stephen Hemminger080f22c2006-09-13 21:13:54 -0700180 depends on EXPERIMENTAL && BROKEN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 ---help---
182 The Frame Diverter allows you to divert packets from the
183 network, that are not aimed at the interface receiving it (in
184 promisc. mode). Typically, a Linux box setup as an Ethernet bridge
185 with the Frames Diverter on, can do some *really* transparent www
186 caching using a Squid proxy for example.
187
188 This is very useful when you don't want to change your router's
189 config (or if you simply don't have access to it).
190
191 The other possible usages of diverting Ethernet Frames are
192 numberous:
193 - reroute smtp traffic to another interface
194 - traffic-shape certain network streams
195 - transparently proxy smtp connections
196 - etc...
197
198 For more informations, please refer to:
199 <http://diverter.sourceforge.net/>
200 <http://perso.wanadoo.fr/magpie/EtherDivert.html>
201
202 If unsure, say N.
203
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700204source "net/econet/Kconfig"
205source "net/wanrouter/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206source "net/sched/Kconfig"
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208menu "Network testing"
209
210config NET_PKTGEN
211 tristate "Packet Generator (USE WITH CAUTION)"
212 depends on PROC_FS
213 ---help---
214 This module will inject preconfigured packets, at a configurable
215 rate, out of a given interface. It is used for network interface
216 stress testing and performance analysis. If you don't understand
217 what was just said, you don't need it: say N.
218
219 Documentation on how to use the packet generator can be found
220 at <file:Documentation/networking/pktgen.txt>.
221
222 To compile this code as a module, choose M here: the
223 module will be called pktgen.
224
Stephen Hemmingera42e9d62006-06-05 17:30:32 -0700225config NET_TCPPROBE
226 tristate "TCP connection probing"
227 depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
228 ---help---
229 This module allows for capturing the changes to TCP connection
Dave Jones9dadaa192006-06-08 23:42:09 -0700230 state in response to incoming packets. It is used for debugging
Stephen Hemmingera42e9d62006-06-05 17:30:32 -0700231 TCP congestion avoidance modules. If you don't understand
232 what was just said, you don't need it: say N.
233
234 Documentation on how to use the packet generator can be found
235 at http://linux-net.osdl.org/index.php/TcpProbe
236
237 To compile this code as a module, choose M here: the
238 module will be called tcp_probe.
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240endmenu
241
242endmenu
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244source "net/ax25/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245source "net/irda/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246source "net/bluetooth/Kconfig"
Jeff Garzikb4538722005-05-12 22:48:20 -0400247source "net/ieee80211/Kconfig"
248
Adrian Bunkd86b5e02006-01-21 00:46:55 +0100249config WIRELESS_EXT
250 bool
251
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700252endif # if NET
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700253endmenu # Networking
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254