Linux and Unix netstat command
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About netstat
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Shows network status.
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 |
| -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. |
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 the amount of active connections on port 80. Removing the pipe and wc command would display each connection.
netstat -natp
Display active Internet connections.