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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070069menuconfig NETFILTER
70 bool "Network packet filtering (replaces ipchains)"
71 ---help---
72 Netfilter is a framework for filtering and mangling network packets
73 that pass through your Linux box.
74
75 The most common use of packet filtering is to run your Linux box as
76 a firewall protecting a local network from the Internet. The type of
77 firewall provided by this kernel support is called a "packet
78 filter", which means that it can reject individual network packets
79 based on type, source, destination etc. The other kind of firewall,
80 a "proxy-based" one, is more secure but more intrusive and more
81 bothersome to set up; it inspects the network traffic much more
82 closely, modifies it and has knowledge about the higher level
83 protocols, which a packet filter lacks. Moreover, proxy-based
84 firewalls often require changes to the programs running on the local
85 clients. Proxy-based firewalls don't need support by the kernel, but
86 they are often combined with a packet filter, which only works if
87 you say Y here.
88
89 You should also say Y here if you intend to use your Linux box as
90 the gateway to the Internet for a local network of machines without
91 globally valid IP addresses. This is called "masquerading": if one
92 of the computers on your local network wants to send something to
93 the outside, your box can "masquerade" as that computer, i.e. it
94 forwards the traffic to the intended outside destination, but
95 modifies the packets to make it look like they came from the
96 firewall box itself. It works both ways: if the outside host
97 replies, the Linux box will silently forward the traffic to the
98 correct local computer. This way, the computers on your local net
99 are completely invisible to the outside world, even though they can
100 reach the outside and can receive replies. It is even possible to
101 run globally visible servers from within a masqueraded local network
102 using a mechanism called portforwarding. Masquerading is also often
103 called NAT (Network Address Translation).
104
105 Another use of Netfilter is in transparent proxying: if a machine on
106 the local network tries to connect to an outside host, your Linux
107 box can transparently forward the traffic to a local server,
108 typically a caching proxy server.
109
110 Yet another use of Netfilter is building a bridging firewall. Using
111 a bridge with Network packet filtering enabled makes iptables "see"
112 the bridged traffic. For filtering on the lower network and Ethernet
113 protocols over the bridge, use ebtables (under bridge netfilter
114 configuration).
115
116 Various modules exist for netfilter which replace the previous
117 masquerading (ipmasqadm), packet filtering (ipchains), transparent
118 proxying, and portforwarding mechanisms. Please see
119 <file:Documentation/Changes> under "iptables" for the location of
120 these packages.
121
122 Make sure to say N to "Fast switching" below if you intend to say Y
123 here, as Fast switching currently bypasses netfilter.
124
125 Chances are that you should say Y here if you compile a kernel which
126 will run as a router and N for regular hosts. If unsure, say N.
127
128if NETFILTER
129
130config NETFILTER_DEBUG
131 bool "Network packet filtering debugging"
132 depends on NETFILTER
133 help
134 You can say Y here if you want to get additional messages useful in
135 debugging the netfilter code.
136
137config BRIDGE_NETFILTER
138 bool "Bridged IP/ARP packets filtering"
139 depends on BRIDGE && NETFILTER && INET
140 default y
141 ---help---
142 Enabling this option will let arptables resp. iptables see bridged
143 ARP resp. IP traffic. If you want a bridging firewall, you probably
144 want this option enabled.
145 Enabling or disabling this option doesn't enable or disable
146 ebtables.
147
148 If unsure, say N.
149
Harald Welte9eb0eec2005-09-17 00:41:21 -0700150source "net/netfilter/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151source "net/ipv4/netfilter/Kconfig"
152source "net/ipv6/netfilter/Kconfig"
153source "net/decnet/netfilter/Kconfig"
154source "net/bridge/netfilter/Kconfig"
155
156endif
157
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700158source "net/dccp/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159source "net/sctp/Kconfig"
Per Liden1e63e682006-01-16 16:39:13 +0100160source "net/tipc/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700161source "net/atm/Kconfig"
162source "net/bridge/Kconfig"
163source "net/8021q/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164source "net/decnet/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165source "net/llc/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166source "net/ipx/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167source "drivers/net/appletalk/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700168source "net/x25/Kconfig"
169source "net/lapb/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171config NET_DIVERT
172 bool "Frame Diverter (EXPERIMENTAL)"
173 depends on EXPERIMENTAL
174 ---help---
175 The Frame Diverter allows you to divert packets from the
176 network, that are not aimed at the interface receiving it (in
177 promisc. mode). Typically, a Linux box setup as an Ethernet bridge
178 with the Frames Diverter on, can do some *really* transparent www
179 caching using a Squid proxy for example.
180
181 This is very useful when you don't want to change your router's
182 config (or if you simply don't have access to it).
183
184 The other possible usages of diverting Ethernet Frames are
185 numberous:
186 - reroute smtp traffic to another interface
187 - traffic-shape certain network streams
188 - transparently proxy smtp connections
189 - etc...
190
191 For more informations, please refer to:
192 <http://diverter.sourceforge.net/>
193 <http://perso.wanadoo.fr/magpie/EtherDivert.html>
194
195 If unsure, say N.
196
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700197source "net/econet/Kconfig"
198source "net/wanrouter/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199source "net/sched/Kconfig"
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201menu "Network testing"
202
203config NET_PKTGEN
204 tristate "Packet Generator (USE WITH CAUTION)"
205 depends on PROC_FS
206 ---help---
207 This module will inject preconfigured packets, at a configurable
208 rate, out of a given interface. It is used for network interface
209 stress testing and performance analysis. If you don't understand
210 what was just said, you don't need it: say N.
211
212 Documentation on how to use the packet generator can be found
213 at <file:Documentation/networking/pktgen.txt>.
214
215 To compile this code as a module, choose M here: the
216 module will be called pktgen.
217
218endmenu
219
220endmenu
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222source "net/ax25/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223source "net/irda/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224source "net/bluetooth/Kconfig"
Jeff Garzikb4538722005-05-12 22:48:20 -0400225source "net/ieee80211/Kconfig"
226
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700227endif # if NET
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700228endmenu # Networking
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229