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+Documentation for /proc/sys/net/* kernel version 2.4.0-test11-pre4
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+ (c) 1999 Terrehon Bowden <terrehon@pacbell.net>
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+ Bodo Bauer <bb@ricochet.net>
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+ (c) 2000 Jorge Nerin <comandante@zaralinux.com>
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+ (c) 2009 Shen Feng <shen@cn.fujitsu.com>
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+
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+For general info and legal blurb, please look in README.
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+
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+==============================================================
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+
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+This file contains the documentation for the sysctl files in
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+/proc/sys/net and is valid for Linux kernel version 2.4.0-test11-pre4.
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+
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+The interface to the networking parts of the kernel is located in
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+/proc/sys/net. The following table shows all possible subdirectories.You may
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+see only some of them, depending on your kernel's configuration.
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+
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+
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+Table : Subdirectories in /proc/sys/net
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+..............................................................................
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+ Directory Content Directory Content
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+ core General parameter appletalk Appletalk protocol
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+ unix Unix domain sockets netrom NET/ROM
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+ 802 E802 protocol ax25 AX25
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+ ethernet Ethernet protocol rose X.25 PLP layer
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+ ipv4 IP version 4 x25 X.25 protocol
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+ ipx IPX token-ring IBM token ring
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+ bridge Bridging decnet DEC net
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+ ipv6 IP version 6
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+..............................................................................
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+
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+1. /proc/sys/net/core - Network core options
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+-------------------------------------------------------
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+
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+rmem_default
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+------------
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+
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+The default setting of the socket receive buffer in bytes.
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+
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+rmem_max
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+--------
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+
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+The maximum receive socket buffer size in bytes.
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+
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+wmem_default
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+------------
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+
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+The default setting (in bytes) of the socket send buffer.
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+
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+wmem_max
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+--------
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+
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+The maximum send socket buffer size in bytes.
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+
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+message_burst and message_cost
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+------------------------------
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+
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+These parameters are used to limit the warning messages written to the kernel
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+log from the networking code. They enforce a rate limit to make a
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+denial-of-service attack impossible. A higher message_cost factor, results in
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+fewer messages that will be written. Message_burst controls when messages will
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+be dropped. The default settings limit warning messages to one every five
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+seconds.
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+
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+warnings
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+--------
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+
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+This controls console messages from the networking stack that can occur because
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+of problems on the network like duplicate address or bad checksums. Normally,
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+this should be enabled, but if the problem persists the messages can be
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+disabled.
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+
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+netdev_budget
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+-------------
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+
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+Maximum number of packets taken from all interfaces in one polling cycle (NAPI
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+poll). In one polling cycle interfaces which are registered to polling are
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+probed in a round-robin manner. The limit of packets in one such probe can be
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+set per-device via sysfs class/net/<device>/weight .
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+
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+netdev_max_backlog
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+------------------
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+
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+Maximum number of packets, queued on the INPUT side, when the interface
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+receives packets faster than kernel can process them.
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+
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+optmem_max
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+----------
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+
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+Maximum ancillary buffer size allowed per socket. Ancillary data is a sequence
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+of struct cmsghdr structures with appended data.
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+
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+2. /proc/sys/net/unix - Parameters for Unix domain sockets
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+-------------------------------------------------------
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+
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+There are only two files in this subdirectory. They control the delays for
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+deleting and destroying socket descriptors.
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+
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+
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+3. /proc/sys/net/ipv4 - IPV4 settings
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+-------------------------------------------------------
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+Please see: Documentation/networking/ip-sysctl.txt and ipvs-sysctl.txt for
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+descriptions of these entries.
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+
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+
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+4. Appletalk
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+-------------------------------------------------------
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+
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+The /proc/sys/net/appletalk directory holds the Appletalk configuration data
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+when Appletalk is loaded. The configurable parameters are:
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+
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+aarp-expiry-time
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+----------------
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+
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+The amount of time we keep an ARP entry before expiring it. Used to age out
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+old hosts.
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+
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+aarp-resolve-time
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+-----------------
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+
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+The amount of time we will spend trying to resolve an Appletalk address.
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+
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+aarp-retransmit-limit
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+---------------------
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+
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+The number of times we will retransmit a query before giving up.
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+
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+aarp-tick-time
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+--------------
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+
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+Controls the rate at which expires are checked.
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+
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+The directory /proc/net/appletalk holds the list of active Appletalk sockets
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+on a machine.
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+
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+The fields indicate the DDP type, the local address (in network:node format)
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+the remote address, the size of the transmit pending queue, the size of the
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+received queue (bytes waiting for applications to read) the state and the uid
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+owning the socket.
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+
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+/proc/net/atalk_iface lists all the interfaces configured for appletalk.It
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+shows the name of the interface, its Appletalk address, the network range on
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+that address (or network number for phase 1 networks), and the status of the
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+interface.
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+
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+/proc/net/atalk_route lists each known network route. It lists the target
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+(network) that the route leads to, the router (may be directly connected), the
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+route flags, and the device the route is using.
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+
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+
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+5. IPX
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+-------------------------------------------------------
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+
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+The IPX protocol has no tunable values in proc/sys/net.
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+
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+The IPX protocol does, however, provide proc/net/ipx. This lists each IPX
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+socket giving the local and remote addresses in Novell format (that is
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+network:node:port). In accordance with the strange Novell tradition,
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+everything but the port is in hex. Not_Connected is displayed for sockets that
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+are not tied to a specific remote address. The Tx and Rx queue sizes indicate
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+the number of bytes pending for transmission and reception. The state
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+indicates the state the socket is in and the uid is the owning uid of the
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+socket.
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+
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+The /proc/net/ipx_interface file lists all IPX interfaces. For each interface
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+it gives the network number, the node number, and indicates if the network is
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+the primary network. It also indicates which device it is bound to (or
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+Internal for internal networks) and the Frame Type if appropriate. Linux
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+supports 802.3, 802.2, 802.2 SNAP and DIX (Blue Book) ethernet framing for
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+IPX.
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+
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+The /proc/net/ipx_route table holds a list of IPX routes. For each route it
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+gives the destination network, the router node (or Directly) and the network
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+address of the router (or Connected) for internal networks.
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Shen Feng