Linux in a Nutshell, 6th Edition

Name

netstat

Synopsis

netstat [options] [delay]

TCP/IP command. Show network status. Print information on active sockets, routing tables, interfaces, masquerade connections, or multicast memberships. By default, netstat lists open sockets. When a delay is specified, netstat will print new information every delay seconds.

Options

The first five options (-g, -i, -M, -r, and -s) determine what kind of information netstat should display.

-g, --groups

Show multicast group memberships.

-i, --interface[=name]

Show all network interfaces, or just the interface specified by name.

-M, --masquerade

Show masqueraded connections.

-r, --route

Show kernel routing tables.

-s, --statistics

Show statistics for each protocol.

-a, --all

Show all entries.

-A family, --protocol=family

Show connections only for the specified address family. Accepted values are inet, unix, ipx, ax25, netrom, and ddp. Specify multiple families in a comma-separated list.

-c, --continuous

Display information continuously, refreshing once every second.

-C

Print routing information from the route cache.

-e, --extend

Increase level of detail in reports. Use twice for maximum detail.

-F

Print routing information from the forward information database (FIB). This is the default.

-l, --listening

Show only listening sockets.

-n, --numeric

Show network addresses, ports, and users as numbers.

--numeric-hosts

Show host addresses as numbers, but resolve others.

--numeric-ports

Show ports as numbers, but resolve others.

--numeric-users

Show user ID numbers for users, but ...