Netstat Command [Linux/Unix]

Informations:

Netstat command Shows network status.

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Syntax
netstat [-a] [-n] [-v]

netstat [-g | -m | -p | -s | -f address_family ] [-n] [-P protocol]

netstat [ -i ] [ -I interface ] [ interval ]

netstat -r [-a] [-n] [-v ]

netstat -M [-n] [-s ]

netstat -D [ -I interface ]

-a	Show the state of all sockets and all routing table entries; normally, sockets used by server processes are not shown and only interface, host, network, and default routes are shown.
-n	Show network addresses as numbers. netstat normally displays addresses as symbols. This option may be used with any of the display formats.
-v	Verbose. Show additional information for the sockets and the routing table.
-g	Show the multicast group memberships for all interfaces.
-m	Show the STREAMS statistics.
-p	Show the address resolution (ARP) tables.
-s	Show per-protocol statistics. When used with the -M option, show multicast routing statistics instead.
-i	Show the state of the interfaces that are used for TCP/IP traffic.
-r	Show the routing tables.
-M	Show the multicast routing tables. When used with the -s option, show multicast routing statistics instead.
-d	Show the state of all interfaces that are under Dynamic Host Configuration Protocol (DHCP) control.
-D	Show the status of DHCP configured interfaces.
-f address_family	imit statistics or address control block reports to those of the specified address_family, which can be one of: inet For the AF_INET address family unix For the AF_Unix address family
-P protocol	Limit display of statistics or state of all sockets to those applicable to protocol.
- I interface	Show the state of a particular interface. interface can be any valid interface such as ie0 or le0.

Examples:

netstat

Displays generic net statistics of the host you are currently connected to.

netstat -an

Shows all connections to the server including the source and destination ips and ports if you have proper permissions.

netstat -rn

Displays routing table for all ips bound to the server.

netstat -an |grep :80 |wc -l

Display all active connections on port 80.

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