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Contents

NAME

ss − another utility to investigate sockets

SYNOPSIS

ss [options] [ FILTER ]

DESCRIPTION

ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state informations than other tools.

OPTIONS

These programs follow the usual GNU command line syntax, with long options starting with two dashes (‘-’). A summary of options is included below.
−h, −−help

Show summary of options.

−V, −−version

Output version information.

−n, −−numeric

Do now try to resolve service names.

−r, −−resolve

Try to resolve numeric address/ports.

−a, −−all

Display all sockets.

−l, −−listening

Display listening sockets.

−o, −−options

Show timer information.

−e, −−extended

Show detailed socket information

−m, −−memory

Show socket memory usage.

−p, −−processes

Show process using socket.

−i, −−info

Show internal TCP information.

−s, −−summary

Print summary statistics. This option does not parse socket lists obtaining summary from various sources. It is useful when amount of sockets is so huge that parsing /proc/net/tcp is painful.

−4, −−ipv4

Display only IP version 4 sockets (alias for -f inet).

−6, −−ipv6

Display only IP version 6 sockets (alias for -f inet6).

−0, −−packet

Display PACKET sockets.

−t, −−tcp

Display only TCP sockets.

−u, −−udp

Display only UDP sockets.

−d, −−dccp

Display only DCCP sockets.

−w, −−raw

Display only RAW sockets.

−x, −−unix

Display only Unix domain sockets.

−f FAMILY, −−family=FAMILY

Display sockets of type FAMILY. Currently the following families are supported: unix, inet, inet6, link, netlink.

−A QUERY, −−query=QUERY

List of socket tables to dump, separated by commas. The following identifiers are understood: all, inet, tcp, udp, raw, unix, packet, netlink, unix_dgram, unix_stream, packet_raw, packet_dgram.

−D FILE

Do not display anything, just dump raw information about TCP sockets to FILE after applying filters. If FILE is - stdout is used.

−F FILE, −−filter=FILE

Read filter information from FILE. Each line of FILE is interpreted like single command line option. If FILE is - stdin is used.

FILTER := [ state TCP-STATE ] [ EXPRESSION ]

Please take a look at the official documentation (Debian package iproute-doc) for details regarding filters.

USAGE EXAMPLES

ss -t -a

Display all TCP sockets.

ss -u -a

Display all UDP sockets.

ss -o state established ’( dport = :ssh or sport = :ssh )’

Display all established ssh connections.

ss -x src /tmp/.X11-unix/*

Find all local processes connected to X server.

ss -o state fin-wait-1 ’( sport = :http or sport = :https )’ dst
193.233.7/24

List all the tcp sockets in state FIN-WAIT-1 for our apache to network 193.233.7/24 and look at their timers.

SEE ALSO

ip(8), /usr/share/doc/iproute-doc/ss.html (package iproutedoc)

AUTHOR

ss was written by Alexey Kuznetosv, <kuznet [AT] ms2.ru>.

This manual page was written by Michael Prokop <mika [AT] grml.org> for the Debian project (but may be used by others).

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