1# 2# Network configuration 3# 4 5menuconfig NET 6 bool "Networking support" 7 ---help--- 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 11 other computer. 12 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>. 18 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>. 22 23if NET 24 25menu "Networking options" 26 27config COMPAT_NET_DEV_OPS 28 def_bool y 29 30source "net/packet/Kconfig" 31source "net/unix/Kconfig" 32source "net/xfrm/Kconfig" 33source "net/iucv/Kconfig" 34 35config INET 36 bool "TCP/IP networking" 37 ---help--- 38 These are the protocols used on the Internet and on most local 39 Ethernets. It is highly recommended to say Y here (this will enlarge 40 your kernel by about 400 KB), since some programs (e.g. the X window 41 system) use TCP/IP even if your machine is not connected to any 42 other computer. You will get the so-called loopback device which 43 allows you to ping yourself (great fun, that!). 44 45 For an excellent introduction to Linux networking, please read the 46 Linux Networking HOWTO, available from 47 <http://www.tldp.org/docs.html#howto>. 48 49 If you say Y here and also to "/proc file system support" and 50 "Sysctl support" below, you can change various aspects of the 51 behavior of the TCP/IP code by writing to the (virtual) files in 52 /proc/sys/net/ipv4/*; the options are explained in the file 53 <file:Documentation/networking/ip-sysctl.txt>. 54 55 Short answer: say Y. 56 57if INET 58source "net/ipv4/Kconfig" 59source "net/ipv6/Kconfig" 60source "net/netlabel/Kconfig" 61 62endif # if INET 63 64config NETWORK_SECMARK 65 bool "Security Marking" 66 help 67 This enables security marking of network packets, similar 68 to nfmark, but designated for security purposes. 69 If you are unsure how to answer this question, answer N. 70 71menuconfig NETFILTER 72 bool "Network packet filtering framework (Netfilter)" 73 ---help--- 74 Netfilter is a framework for filtering and mangling network packets 75 that pass through your Linux box. 76 77 The most common use of packet filtering is to run your Linux box as 78 a firewall protecting a local network from the Internet. The type of 79 firewall provided by this kernel support is called a "packet 80 filter", which means that it can reject individual network packets 81 based on type, source, destination etc. The other kind of firewall, 82 a "proxy-based" one, is more secure but more intrusive and more 83 bothersome to set up; it inspects the network traffic much more 84 closely, modifies it and has knowledge about the higher level 85 protocols, which a packet filter lacks. Moreover, proxy-based 86 firewalls often require changes to the programs running on the local 87 clients. Proxy-based firewalls don't need support by the kernel, but 88 they are often combined with a packet filter, which only works if 89 you say Y here. 90 91 You should also say Y here if you intend to use your Linux box as 92 the gateway to the Internet for a local network of machines without 93 globally valid IP addresses. This is called "masquerading": if one 94 of the computers on your local network wants to send something to 95 the outside, your box can "masquerade" as that computer, i.e. it 96 forwards the traffic to the intended outside destination, but 97 modifies the packets to make it look like they came from the 98 firewall box itself. It works both ways: if the outside host 99 replies, the Linux box will silently forward the traffic to the 100 correct local computer. This way, the computers on your local net 101 are completely invisible to the outside world, even though they can 102 reach the outside and can receive replies. It is even possible to 103 run globally visible servers from within a masqueraded local network 104 using a mechanism called portforwarding. Masquerading is also often 105 called NAT (Network Address Translation). 106 107 Another use of Netfilter is in transparent proxying: if a machine on 108 the local network tries to connect to an outside host, your Linux 109 box can transparently forward the traffic to a local server, 110 typically a caching proxy server. 111 112 Yet another use of Netfilter is building a bridging firewall. Using 113 a bridge with Network packet filtering enabled makes iptables "see" 114 the bridged traffic. For filtering on the lower network and Ethernet 115 protocols over the bridge, use ebtables (under bridge netfilter 116 configuration). 117 118 Various modules exist for netfilter which replace the previous 119 masquerading (ipmasqadm), packet filtering (ipchains), transparent 120 proxying, and portforwarding mechanisms. Please see 121 <file:Documentation/Changes> under "iptables" for the location of 122 these packages. 123 124 Make sure to say N to "Fast switching" below if you intend to say Y 125 here, as Fast switching currently bypasses netfilter. 126 127 Chances are that you should say Y here if you compile a kernel which 128 will run as a router and N for regular hosts. If unsure, say N. 129 130if NETFILTER 131 132config NETFILTER_DEBUG 133 bool "Network packet filtering debugging" 134 depends on NETFILTER 135 help 136 You can say Y here if you want to get additional messages useful in 137 debugging the netfilter code. 138 139config NETFILTER_ADVANCED 140 bool "Advanced netfilter configuration" 141 depends on NETFILTER 142 default y 143 help 144 If you say Y here you can select between all the netfilter modules. 145 If you say N the more ununsual ones will not be shown and the 146 basic ones needed by most people will default to 'M'. 147 148 If unsure, say Y. 149 150config BRIDGE_NETFILTER 151 bool "Bridged IP/ARP packets filtering" 152 depends on BRIDGE && NETFILTER && INET 153 depends on NETFILTER_ADVANCED 154 default y 155 ---help--- 156 Enabling this option will let arptables resp. iptables see bridged 157 ARP resp. IP traffic. If you want a bridging firewall, you probably 158 want this option enabled. 159 Enabling or disabling this option doesn't enable or disable 160 ebtables. 161 162 If unsure, say N. 163 164source "net/netfilter/Kconfig" 165source "net/ipv4/netfilter/Kconfig" 166source "net/ipv6/netfilter/Kconfig" 167source "net/decnet/netfilter/Kconfig" 168source "net/bridge/netfilter/Kconfig" 169 170endif 171 172source "net/dccp/Kconfig" 173source "net/sctp/Kconfig" 174source "net/tipc/Kconfig" 175source "net/atm/Kconfig" 176source "net/802/Kconfig" 177source "net/bridge/Kconfig" 178source "net/dsa/Kconfig" 179source "net/8021q/Kconfig" 180source "net/decnet/Kconfig" 181source "net/llc/Kconfig" 182source "net/ipx/Kconfig" 183source "drivers/net/appletalk/Kconfig" 184source "net/x25/Kconfig" 185source "net/lapb/Kconfig" 186source "net/econet/Kconfig" 187source "net/wanrouter/Kconfig" 188source "net/sched/Kconfig" 189source "net/dcb/Kconfig" 190 191menu "Network testing" 192 193config NET_PKTGEN 194 tristate "Packet Generator (USE WITH CAUTION)" 195 depends on PROC_FS 196 ---help--- 197 This module will inject preconfigured packets, at a configurable 198 rate, out of a given interface. It is used for network interface 199 stress testing and performance analysis. If you don't understand 200 what was just said, you don't need it: say N. 201 202 Documentation on how to use the packet generator can be found 203 at <file:Documentation/networking/pktgen.txt>. 204 205 To compile this code as a module, choose M here: the 206 module will be called pktgen. 207 208config NET_TCPPROBE 209 tristate "TCP connection probing" 210 depends on INET && EXPERIMENTAL && PROC_FS && KPROBES 211 ---help--- 212 This module allows for capturing the changes to TCP connection 213 state in response to incoming packets. It is used for debugging 214 TCP congestion avoidance modules. If you don't understand 215 what was just said, you don't need it: say N. 216 217 Documentation on how to use TCP connection probing can be found 218 at http://linux-net.osdl.org/index.php/TcpProbe 219 220 To compile this code as a module, choose M here: the 221 module will be called tcp_probe. 222 223endmenu 224 225endmenu 226 227source "net/ax25/Kconfig" 228source "net/can/Kconfig" 229source "net/irda/Kconfig" 230source "net/bluetooth/Kconfig" 231source "net/rxrpc/Kconfig" 232source "net/phonet/Kconfig" 233 234config FIB_RULES 235 bool 236 237menuconfig WIRELESS 238 bool "Wireless" 239 depends on !S390 240 default y 241 242if WIRELESS 243 244source "net/wireless/Kconfig" 245source "net/mac80211/Kconfig" 246 247endif # WIRELESS 248 249source "net/wimax/Kconfig" 250 251source "net/rfkill/Kconfig" 252source "net/9p/Kconfig" 253 254endif # if NET 255