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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"
Paul Moore38c94372006-11-05 16:44:06 -080066source "net/netlabel/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -070068endif # if INET
69
James Morris984bc162006-06-09 00:29:17 -070070config NETWORK_SECMARK
71 bool "Security Marking"
72 help
73 This enables security marking of network packets, similar
74 to nfmark, but designated for security purposes.
75 If you are unsure how to answer this question, answer N.
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077menuconfig NETFILTER
78 bool "Network packet filtering (replaces ipchains)"
79 ---help---
80 Netfilter is a framework for filtering and mangling network packets
81 that pass through your Linux box.
82
83 The most common use of packet filtering is to run your Linux box as
84 a firewall protecting a local network from the Internet. The type of
85 firewall provided by this kernel support is called a "packet
86 filter", which means that it can reject individual network packets
87 based on type, source, destination etc. The other kind of firewall,
88 a "proxy-based" one, is more secure but more intrusive and more
89 bothersome to set up; it inspects the network traffic much more
90 closely, modifies it and has knowledge about the higher level
91 protocols, which a packet filter lacks. Moreover, proxy-based
92 firewalls often require changes to the programs running on the local
93 clients. Proxy-based firewalls don't need support by the kernel, but
94 they are often combined with a packet filter, which only works if
95 you say Y here.
96
97 You should also say Y here if you intend to use your Linux box as
98 the gateway to the Internet for a local network of machines without
99 globally valid IP addresses. This is called "masquerading": if one
100 of the computers on your local network wants to send something to
101 the outside, your box can "masquerade" as that computer, i.e. it
102 forwards the traffic to the intended outside destination, but
103 modifies the packets to make it look like they came from the
104 firewall box itself. It works both ways: if the outside host
105 replies, the Linux box will silently forward the traffic to the
106 correct local computer. This way, the computers on your local net
107 are completely invisible to the outside world, even though they can
108 reach the outside and can receive replies. It is even possible to
109 run globally visible servers from within a masqueraded local network
110 using a mechanism called portforwarding. Masquerading is also often
111 called NAT (Network Address Translation).
112
113 Another use of Netfilter is in transparent proxying: if a machine on
114 the local network tries to connect to an outside host, your Linux
115 box can transparently forward the traffic to a local server,
116 typically a caching proxy server.
117
118 Yet another use of Netfilter is building a bridging firewall. Using
119 a bridge with Network packet filtering enabled makes iptables "see"
120 the bridged traffic. For filtering on the lower network and Ethernet
121 protocols over the bridge, use ebtables (under bridge netfilter
122 configuration).
123
124 Various modules exist for netfilter which replace the previous
125 masquerading (ipmasqadm), packet filtering (ipchains), transparent
126 proxying, and portforwarding mechanisms. Please see
127 <file:Documentation/Changes> under "iptables" for the location of
128 these packages.
129
130 Make sure to say N to "Fast switching" below if you intend to say Y
131 here, as Fast switching currently bypasses netfilter.
132
133 Chances are that you should say Y here if you compile a kernel which
134 will run as a router and N for regular hosts. If unsure, say N.
135
136if NETFILTER
137
138config NETFILTER_DEBUG
139 bool "Network packet filtering debugging"
140 depends on NETFILTER
141 help
142 You can say Y here if you want to get additional messages useful in
143 debugging the netfilter code.
144
145config BRIDGE_NETFILTER
146 bool "Bridged IP/ARP packets filtering"
147 depends on BRIDGE && NETFILTER && INET
148 default y
149 ---help---
150 Enabling this option will let arptables resp. iptables see bridged
151 ARP resp. IP traffic. If you want a bridging firewall, you probably
152 want this option enabled.
153 Enabling or disabling this option doesn't enable or disable
154 ebtables.
155
156 If unsure, say N.
157
Harald Welte9eb0eec2005-09-17 00:41:21 -0700158source "net/netfilter/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159source "net/ipv4/netfilter/Kconfig"
160source "net/ipv6/netfilter/Kconfig"
161source "net/decnet/netfilter/Kconfig"
162source "net/bridge/netfilter/Kconfig"
163
164endif
165
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700166source "net/dccp/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167source "net/sctp/Kconfig"
Per Liden1e63e682006-01-16 16:39:13 +0100168source "net/tipc/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700169source "net/atm/Kconfig"
170source "net/bridge/Kconfig"
171source "net/8021q/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172source "net/decnet/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173source "net/llc/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174source "net/ipx/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175source "drivers/net/appletalk/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700176source "net/x25/Kconfig"
177source "net/lapb/Kconfig"
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700178source "net/econet/Kconfig"
179source "net/wanrouter/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180source "net/sched/Kconfig"
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182menu "Network testing"
183
184config NET_PKTGEN
185 tristate "Packet Generator (USE WITH CAUTION)"
186 depends on PROC_FS
187 ---help---
188 This module will inject preconfigured packets, at a configurable
189 rate, out of a given interface. It is used for network interface
190 stress testing and performance analysis. If you don't understand
191 what was just said, you don't need it: say N.
192
193 Documentation on how to use the packet generator can be found
194 at <file:Documentation/networking/pktgen.txt>.
195
196 To compile this code as a module, choose M here: the
197 module will be called pktgen.
198
Stephen Hemmingera42e9d62006-06-05 17:30:32 -0700199config NET_TCPPROBE
200 tristate "TCP connection probing"
201 depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
202 ---help---
203 This module allows for capturing the changes to TCP connection
Dave Jones9dadaa192006-06-08 23:42:09 -0700204 state in response to incoming packets. It is used for debugging
Stephen Hemmingera42e9d62006-06-05 17:30:32 -0700205 TCP congestion avoidance modules. If you don't understand
206 what was just said, you don't need it: say N.
207
Grant Grundler82fe7c92006-09-25 23:47:14 -0700208 Documentation on how to use TCP connection probing can be found
Stephen Hemmingera42e9d62006-06-05 17:30:32 -0700209 at http://linux-net.osdl.org/index.php/TcpProbe
210
211 To compile this code as a module, choose M here: the
212 module will be called tcp_probe.
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214endmenu
215
216endmenu
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218source "net/ax25/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219source "net/irda/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220source "net/bluetooth/Kconfig"
Jeff Garzikb4538722005-05-12 22:48:20 -0400221source "net/ieee80211/Kconfig"
222
Adrian Bunkd86b5e02006-01-21 00:46:55 +0100223config WIRELESS_EXT
224 bool
225
Thomas Graf14c0b972006-08-04 03:38:38 -0700226config FIB_RULES
227 bool
228
Sam Ravnborg6a2e9b72005-07-11 21:13:56 -0700229endif # if NET
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700230endmenu # Networking
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231