tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
1
fork

Configure Feed

Select the types of activity you want to include in your feed.

kernel / Documentation / sysctl / net.txt
at v3.0-rc4 196 lines 7.1 kB view raw
1Documentation for /proc/sys/net/* kernel version 2.4.0-test11-pre4 2 (c) 1999 Terrehon Bowden <terrehon@pacbell.net> 3 Bodo Bauer <bb@ricochet.net> 4 (c) 2000 Jorge Nerin <comandante@zaralinux.com> 5 (c) 2009 Shen Feng <shen@cn.fujitsu.com> 6 7For general info and legal blurb, please look in README. 8 9============================================================== 10 11This file contains the documentation for the sysctl files in 12/proc/sys/net and is valid for Linux kernel version 2.4.0-test11-pre4. 13 14The interface to the networking parts of the kernel is located in 15/proc/sys/net. The following table shows all possible subdirectories.You may 16see only some of them, depending on your kernel's configuration. 17 18 19Table : Subdirectories in /proc/sys/net 20.............................................................................. 21 Directory Content Directory Content 22 core General parameter appletalk Appletalk protocol 23 unix Unix domain sockets netrom NET/ROM 24 802 E802 protocol ax25 AX25 25 ethernet Ethernet protocol rose X.25 PLP layer 26 ipv4 IP version 4 x25 X.25 protocol 27 ipx IPX token-ring IBM token ring 28 bridge Bridging decnet DEC net 29 ipv6 IP version 6 30.............................................................................. 31 321. /proc/sys/net/core - Network core options 33------------------------------------------------------- 34 35bpf_jit_enable 36-------------- 37 38This enables Berkeley Packet Filter Just in Time compiler. 39Currently supported on x86_64 architecture, bpf_jit provides a framework 40to speed packet filtering, the one used by tcpdump/libpcap for example. 41Values : 42 0 - disable the JIT (default value) 43 1 - enable the JIT 44 2 - enable the JIT and ask the compiler to emit traces on kernel log. 45 46rmem_default 47------------ 48 49The default setting of the socket receive buffer in bytes. 50 51rmem_max 52-------- 53 54The maximum receive socket buffer size in bytes. 55 56wmem_default 57------------ 58 59The default setting (in bytes) of the socket send buffer. 60 61wmem_max 62-------- 63 64The maximum send socket buffer size in bytes. 65 66message_burst and message_cost 67------------------------------ 68 69These parameters are used to limit the warning messages written to the kernel 70log from the networking code. They enforce a rate limit to make a 71denial-of-service attack impossible. A higher message_cost factor, results in 72fewer messages that will be written. Message_burst controls when messages will 73be dropped. The default settings limit warning messages to one every five 74seconds. 75 76warnings 77-------- 78 79This controls console messages from the networking stack that can occur because 80of problems on the network like duplicate address or bad checksums. Normally, 81this should be enabled, but if the problem persists the messages can be 82disabled. 83 84netdev_budget 85------------- 86 87Maximum number of packets taken from all interfaces in one polling cycle (NAPI 88poll). In one polling cycle interfaces which are registered to polling are 89probed in a round-robin manner. The limit of packets in one such probe can be 90set per-device via sysfs class/net/<device>/weight . 91 92netdev_max_backlog 93------------------ 94 95Maximum number of packets, queued on the INPUT side, when the interface 96receives packets faster than kernel can process them. 97 98netdev_tstamp_prequeue 99---------------------- 100 101If set to 0, RX packet timestamps can be sampled after RPS processing, when 102the target CPU processes packets. It might give some delay on timestamps, but 103permit to distribute the load on several cpus. 104 105If set to 1 (default), timestamps are sampled as soon as possible, before 106queueing. 107 108optmem_max 109---------- 110 111Maximum ancillary buffer size allowed per socket. Ancillary data is a sequence 112of struct cmsghdr structures with appended data. 113 1142. /proc/sys/net/unix - Parameters for Unix domain sockets 115------------------------------------------------------- 116 117There is only one file in this directory. 118unix_dgram_qlen limits the max number of datagrams queued in Unix domain 119socket's buffer. It will not take effect unless PF_UNIX flag is specified. 120 121 1223. /proc/sys/net/ipv4 - IPV4 settings 123------------------------------------------------------- 124Please see: Documentation/networking/ip-sysctl.txt and ipvs-sysctl.txt for 125descriptions of these entries. 126 127 1284. Appletalk 129------------------------------------------------------- 130 131The /proc/sys/net/appletalk directory holds the Appletalk configuration data 132when Appletalk is loaded. The configurable parameters are: 133 134aarp-expiry-time 135---------------- 136 137The amount of time we keep an ARP entry before expiring it. Used to age out 138old hosts. 139 140aarp-resolve-time 141----------------- 142 143The amount of time we will spend trying to resolve an Appletalk address. 144 145aarp-retransmit-limit 146--------------------- 147 148The number of times we will retransmit a query before giving up. 149 150aarp-tick-time 151-------------- 152 153Controls the rate at which expires are checked. 154 155The directory /proc/net/appletalk holds the list of active Appletalk sockets 156on a machine. 157 158The fields indicate the DDP type, the local address (in network:node format) 159the remote address, the size of the transmit pending queue, the size of the 160received queue (bytes waiting for applications to read) the state and the uid 161owning the socket. 162 163/proc/net/atalk_iface lists all the interfaces configured for appletalk.It 164shows the name of the interface, its Appletalk address, the network range on 165that address (or network number for phase 1 networks), and the status of the 166interface. 167 168/proc/net/atalk_route lists each known network route. It lists the target 169(network) that the route leads to, the router (may be directly connected), the 170route flags, and the device the route is using. 171 172 1735. IPX 174------------------------------------------------------- 175 176The IPX protocol has no tunable values in proc/sys/net. 177 178The IPX protocol does, however, provide proc/net/ipx. This lists each IPX 179socket giving the local and remote addresses in Novell format (that is 180network:node:port). In accordance with the strange Novell tradition, 181everything but the port is in hex. Not_Connected is displayed for sockets that 182are not tied to a specific remote address. The Tx and Rx queue sizes indicate 183the number of bytes pending for transmission and reception. The state 184indicates the state the socket is in and the uid is the owning uid of the 185socket. 186 187The /proc/net/ipx_interface file lists all IPX interfaces. For each interface 188it gives the network number, the node number, and indicates if the network is 189the primary network. It also indicates which device it is bound to (or 190Internal for internal networks) and the Frame Type if appropriate. Linux 191supports 802.3, 802.2, 802.2 SNAP and DIX (Blue Book) ethernet framing for 192IPX. 193 194The /proc/net/ipx_route table holds a list of IPX routes. For each route it 195gives the destination network, the router node (or Directly) and the network 196address of the router (or Connected) for internal networks.