2 # Network configuration
6 bool "Networking support"
8 Unless you really know what you are doing, you should say Y here.
9 The reason is that some programs need kernel networking support even
10 when running on a stand-alone machine that isn't connected to any
13 If you are upgrading from an older kernel, you
14 should consider updating your networking tools too because changes
15 in the kernel and the tools often go hand in hand. The tools are
16 contained in the package net-tools, the location and version number
17 of which are given in <file:Documentation/Changes>.
19 For a general introduction to Linux networking, it is highly
20 recommended to read the NET-HOWTO, available from
21 <http://www.tldp.org/docs.html#howto>.
25 menu "Networking options"
28 bool "Network namespace support"
30 depends on EXPERIMENTAL && NAMESPACES
32 Allow user space to create what appear to be multiple instances
35 config COMPAT_NET_DEV_OPS
38 source "net/packet/Kconfig"
39 source "net/unix/Kconfig"
40 source "net/xfrm/Kconfig"
41 source "net/iucv/Kconfig"
44 bool "TCP/IP networking"
46 These are the protocols used on the Internet and on most local
47 Ethernets. It is highly recommended to say Y here (this will enlarge
48 your kernel by about 400 KB), since some programs (e.g. the X window
49 system) use TCP/IP even if your machine is not connected to any
50 other computer. You will get the so-called loopback device which
51 allows you to ping yourself (great fun, that!).
53 For an excellent introduction to Linux networking, please read the
54 Linux Networking HOWTO, available from
55 <http://www.tldp.org/docs.html#howto>.
57 If you say Y here and also to "/proc file system support" and
58 "Sysctl support" below, you can change various aspects of the
59 behavior of the TCP/IP code by writing to the (virtual) files in
60 /proc/sys/net/ipv4/*; the options are explained in the file
61 <file:Documentation/networking/ip-sysctl.txt>.
66 source "net/ipv4/Kconfig"
67 source "net/ipv6/Kconfig"
68 source "net/netlabel/Kconfig"
72 config NETWORK_SECMARK
73 bool "Security Marking"
75 This enables security marking of network packets, similar
76 to nfmark, but designated for security purposes.
77 If you are unsure how to answer this question, answer N.
80 bool "Network packet filtering framework (Netfilter)"
82 Netfilter is a framework for filtering and mangling network packets
83 that pass through your Linux box.
85 The most common use of packet filtering is to run your Linux box as
86 a firewall protecting a local network from the Internet. The type of
87 firewall provided by this kernel support is called a "packet
88 filter", which means that it can reject individual network packets
89 based on type, source, destination etc. The other kind of firewall,
90 a "proxy-based" one, is more secure but more intrusive and more
91 bothersome to set up; it inspects the network traffic much more
92 closely, modifies it and has knowledge about the higher level
93 protocols, which a packet filter lacks. Moreover, proxy-based
94 firewalls often require changes to the programs running on the local
95 clients. Proxy-based firewalls don't need support by the kernel, but
96 they are often combined with a packet filter, which only works if
99 You should also say Y here if you intend to use your Linux box as
100 the gateway to the Internet for a local network of machines without
101 globally valid IP addresses. This is called "masquerading": if one
102 of the computers on your local network wants to send something to
103 the outside, your box can "masquerade" as that computer, i.e. it
104 forwards the traffic to the intended outside destination, but
105 modifies the packets to make it look like they came from the
106 firewall box itself. It works both ways: if the outside host
107 replies, the Linux box will silently forward the traffic to the
108 correct local computer. This way, the computers on your local net
109 are completely invisible to the outside world, even though they can
110 reach the outside and can receive replies. It is even possible to
111 run globally visible servers from within a masqueraded local network
112 using a mechanism called portforwarding. Masquerading is also often
113 called NAT (Network Address Translation).
115 Another use of Netfilter is in transparent proxying: if a machine on
116 the local network tries to connect to an outside host, your Linux
117 box can transparently forward the traffic to a local server,
118 typically a caching proxy server.
120 Yet another use of Netfilter is building a bridging firewall. Using
121 a bridge with Network packet filtering enabled makes iptables "see"
122 the bridged traffic. For filtering on the lower network and Ethernet
123 protocols over the bridge, use ebtables (under bridge netfilter
126 Various modules exist for netfilter which replace the previous
127 masquerading (ipmasqadm), packet filtering (ipchains), transparent
128 proxying, and portforwarding mechanisms. Please see
129 <file:Documentation/Changes> under "iptables" for the location of
132 Make sure to say N to "Fast switching" below if you intend to say Y
133 here, as Fast switching currently bypasses netfilter.
135 Chances are that you should say Y here if you compile a kernel which
136 will run as a router and N for regular hosts. If unsure, say N.
140 config NETFILTER_DEBUG
141 bool "Network packet filtering debugging"
144 You can say Y here if you want to get additional messages useful in
145 debugging the netfilter code.
147 config NETFILTER_ADVANCED
148 bool "Advanced netfilter configuration"
152 If you say Y here you can select between all the netfilter modules.
153 If you say N the more ununsual ones will not be shown and the
154 basic ones needed by most people will default to 'M'.
158 config BRIDGE_NETFILTER
159 bool "Bridged IP/ARP packets filtering"
160 depends on BRIDGE && NETFILTER && INET
161 depends on NETFILTER_ADVANCED
164 Enabling this option will let arptables resp. iptables see bridged
165 ARP resp. IP traffic. If you want a bridging firewall, you probably
166 want this option enabled.
167 Enabling or disabling this option doesn't enable or disable
172 source "net/netfilter/Kconfig"
173 source "net/ipv4/netfilter/Kconfig"
174 source "net/ipv6/netfilter/Kconfig"
175 source "net/decnet/netfilter/Kconfig"
176 source "net/bridge/netfilter/Kconfig"
180 source "net/dccp/Kconfig"
181 source "net/sctp/Kconfig"
182 source "net/tipc/Kconfig"
183 source "net/atm/Kconfig"
184 source "net/802/Kconfig"
185 source "net/bridge/Kconfig"
186 source "net/dsa/Kconfig"
187 source "net/8021q/Kconfig"
188 source "net/decnet/Kconfig"
189 source "net/llc/Kconfig"
190 source "net/ipx/Kconfig"
191 source "drivers/net/appletalk/Kconfig"
192 source "net/x25/Kconfig"
193 source "net/lapb/Kconfig"
194 source "net/econet/Kconfig"
195 source "net/wanrouter/Kconfig"
196 source "net/sched/Kconfig"
197 source "net/dcb/Kconfig"
199 menu "Network testing"
202 tristate "Packet Generator (USE WITH CAUTION)"
205 This module will inject preconfigured packets, at a configurable
206 rate, out of a given interface. It is used for network interface
207 stress testing and performance analysis. If you don't understand
208 what was just said, you don't need it: say N.
210 Documentation on how to use the packet generator can be found
211 at <file:Documentation/networking/pktgen.txt>.
213 To compile this code as a module, choose M here: the
214 module will be called pktgen.
217 tristate "TCP connection probing"
218 depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
220 This module allows for capturing the changes to TCP connection
221 state in response to incoming packets. It is used for debugging
222 TCP congestion avoidance modules. If you don't understand
223 what was just said, you don't need it: say N.
225 Documentation on how to use TCP connection probing can be found
226 at http://linux-net.osdl.org/index.php/TcpProbe
228 To compile this code as a module, choose M here: the
229 module will be called tcp_probe.
235 source "net/ax25/Kconfig"
236 source "net/can/Kconfig"
237 source "net/irda/Kconfig"
238 source "net/bluetooth/Kconfig"
239 source "net/rxrpc/Kconfig"
240 source "net/phonet/Kconfig"
252 source "net/wireless/Kconfig"
253 source "net/mac80211/Kconfig"
257 source "net/wimax/Kconfig"
259 source "net/rfkill/Kconfig"
260 source "net/9p/Kconfig"