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 source "net/packet/Kconfig"
36 source "net/unix/Kconfig"
37 source "net/xfrm/Kconfig"
38 source "net/iucv/Kconfig"
41 bool "TCP/IP networking"
43 These are the protocols used on the Internet and on most local
44 Ethernets. It is highly recommended to say Y here (this will enlarge
45 your kernel by about 400 KB), since some programs (e.g. the X window
46 system) use TCP/IP even if your machine is not connected to any
47 other computer. You will get the so-called loopback device which
48 allows you to ping yourself (great fun, that!).
50 For an excellent introduction to Linux networking, please read the
51 Linux Networking HOWTO, available from
52 <http://www.tldp.org/docs.html#howto>.
54 If you say Y here and also to "/proc file system support" and
55 "Sysctl support" below, you can change various aspects of the
56 behavior of the TCP/IP code by writing to the (virtual) files in
57 /proc/sys/net/ipv4/*; the options are explained in the file
58 <file:Documentation/networking/ip-sysctl.txt>.
63 source "net/ipv4/Kconfig"
64 source "net/ipv6/Kconfig"
65 source "net/netlabel/Kconfig"
69 config NETWORK_SECMARK
70 bool "Security Marking"
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.
77 bool "Network packet filtering framework (Netfilter)"
79 Netfilter is a framework for filtering and mangling network packets
80 that pass through your Linux box.
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
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).
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.
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
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
129 Make sure to say N to "Fast switching" below if you intend to say Y
130 here, as Fast switching currently bypasses netfilter.
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.
137 config NETFILTER_DEBUG
138 bool "Network packet filtering debugging"
141 You can say Y here if you want to get additional messages useful in
142 debugging the netfilter code.
144 config NETFILTER_ADVANCED
145 bool "Advanced netfilter configuration"
149 If you say Y here you can select between all the netfilter modules.
150 If you say N the more ununsual ones will not be shown and the
151 basic ones needed by most people will default to 'M'.
155 config BRIDGE_NETFILTER
156 bool "Bridged IP/ARP packets filtering"
157 depends on BRIDGE && NETFILTER && INET
158 depends on NETFILTER_ADVANCED
161 Enabling this option will let arptables resp. iptables see bridged
162 ARP resp. IP traffic. If you want a bridging firewall, you probably
163 want this option enabled.
164 Enabling or disabling this option doesn't enable or disable
169 source "net/netfilter/Kconfig"
170 source "net/ipv4/netfilter/Kconfig"
171 source "net/ipv6/netfilter/Kconfig"
172 source "net/decnet/netfilter/Kconfig"
173 source "net/bridge/netfilter/Kconfig"
177 source "net/dccp/Kconfig"
178 source "net/sctp/Kconfig"
179 source "net/tipc/Kconfig"
180 source "net/atm/Kconfig"
181 source "net/802/Kconfig"
182 source "net/bridge/Kconfig"
183 source "net/dsa/Kconfig"
184 source "net/8021q/Kconfig"
185 source "net/decnet/Kconfig"
186 source "net/llc/Kconfig"
187 source "net/ipx/Kconfig"
188 source "drivers/net/appletalk/Kconfig"
189 source "net/x25/Kconfig"
190 source "net/lapb/Kconfig"
191 source "net/econet/Kconfig"
192 source "net/wanrouter/Kconfig"
193 source "net/sched/Kconfig"
195 menu "Network testing"
198 tristate "Packet Generator (USE WITH CAUTION)"
201 This module will inject preconfigured packets, at a configurable
202 rate, out of a given interface. It is used for network interface
203 stress testing and performance analysis. If you don't understand
204 what was just said, you don't need it: say N.
206 Documentation on how to use the packet generator can be found
207 at <file:Documentation/networking/pktgen.txt>.
209 To compile this code as a module, choose M here: the
210 module will be called pktgen.
213 tristate "TCP connection probing"
214 depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
216 This module allows for capturing the changes to TCP connection
217 state in response to incoming packets. It is used for debugging
218 TCP congestion avoidance modules. If you don't understand
219 what was just said, you don't need it: say N.
221 Documentation on how to use TCP connection probing can be found
222 at http://linux-net.osdl.org/index.php/TcpProbe
224 To compile this code as a module, choose M here: the
225 module will be called tcp_probe.
231 source "net/ax25/Kconfig"
232 source "net/can/Kconfig"
233 source "net/irda/Kconfig"
234 source "net/bluetooth/Kconfig"
235 source "net/rxrpc/Kconfig"
236 source "net/phonet/Kconfig"
248 source "net/wireless/Kconfig"
249 source "net/mac80211/Kconfig"
250 source "net/ieee80211/Kconfig"
254 source "net/rfkill/Kconfig"
255 source "net/9p/Kconfig"