Linux: netstat command
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About netstat
The netstat command is used to print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.
Examples
List All Ports (both listening and non listening ports)
List all ports using netstat -a
# netstat -a | moreActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address Statetcp 0 0 localhost:30037 *:* LISTENudp 0 0 *:bootpc *:* Active UNIX domain sockets (servers and established)Proto RefCnt Flags Type State I-Node Pathunix 2 [ ACC ] STREAM LISTENING 6135 /tmp/.X11-unix/X0unix 2 [ ACC ] STREAM LISTENING 5140 /var/run/acpid.socket
List all tcp ports using netstat -at
# netstat -atActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address Statetcp 0 0 localhost:30037 *:* LISTENtcp 0 0 localhost:ipp *:* LISTENtcp 0 0 *:smtp *:* LISTENtcp6 0 0 localhost:ipp [::]:* LISTEN
List all udp ports using netstat -au
# netstat -auActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address Stateudp 0 0 *:bootpc *:*udp 0 0 *:49119 *:*udp 0 0 *:mdns *:*
List Sockets which are in Listening State
List only listening ports using netstat -l
# netstat -lActive Internet connections (only servers)Proto Recv-Q Send-Q Local Address Foreign Address Statetcp 0 0 localhost:ipp *:* LISTENtcp6 0 0 localhost:ipp [::]:* LISTENudp 0 0 *:49119 *:*
List only listening TCP Ports using netstat -lt
# netstat -ltActive Internet connections (only servers)Proto Recv-Q Send-Q Local Address Foreign Address Statetcp 0 0 localhost:30037 *:* LISTENtcp 0 0 *:smtp *:* LISTENtcp6 0 0 localhost:ipp [::]:* LISTEN
List only listening UDP Ports using netstat -lu
# netstat -luActive Internet connections (only servers)Proto Recv-Q Send-Q Local Address Foreign Address Stateudp 0 0 *:49119 *:*udp 0 0 *:mdns *:*
List only the listening UNIX Ports using netstat -lx
# netstat -lxActive UNIX domain sockets (only servers)Proto RefCnt Flags Type State I-Node Pathunix 2 [ ACC ] STREAM LISTENING 6294 private/maildropunix 2 [ ACC ] STREAM LISTENING 6203 public/cleanupunix 2 [ ACC ] STREAM LISTENING 6302 private/ifmailunix 2 [ ACC ] STREAM LISTENING 6306 private/bsmtp
Show the statistics for each protocol
Show statistics for all ports using netstat -s
# netstat -sIp: 11150 total packets received 1 with invalid addresses 0 forwarded 0 incoming packets discarded 11149 incoming packets delivered 11635 requests sent outIcmp: 0 ICMP messages received 0 input ICMP message failed.Tcp: 582 active connections openings 2 failed connection attempts 25 connection resets receivedUdp: 1183 packets received 4 packets to unknown port received......
Show statistics for TCP (or) UDP ports using netstat -st (or) -su
# netstat -st# netstat -su
Display PID and program names in netstat output using netstat -p
netstat -p option can be combined with any other netstat option. This will add the “PID/Program Name” to the netstat output. This is very useful while debugging to identify which program is running on a particular port.
# netstat -ptActive Internet connections (w/o servers)Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program nametcp 1 0 ramesh-laptop.loc:47212 192.168.185.75:www CLOSE_WAIT 2109/firefoxtcp 0 0 ramesh-laptop.loc:52750 lax:www ESTABLISHED 2109/firefox
Don’t resolve host, port and user name in netstat output
When you don’t want the name of the host, port or user to be displayed, use netstat -n option. This will display in numbers, instead of resolving the host name, port name, user name.
This also speeds up the output, as netstat is not performing any look-up.
# netstat -an
If you don’t want only any one of those three items ( ports, or hosts, or users ) to be resolved, use following commands.
# netsat -a --numeric-ports# netsat -a --numeric-hosts# netsat -a --numeric-users
Print netstat information continuously
netstat will print information continuously every few seconds.
# netstat -cActive Internet connections (w/o servers)Proto Recv-Q Send-Q Local Address Foreign Address Statetcp 0 0 ramesh-laptop.loc:36130 101-101-181-225.ama:www ESTABLISHEDtcp 1 1 ramesh-laptop.loc:52564 101.11.169.230:www CLOSINGtcp 0 0 ramesh-laptop.loc:43758 server-101-101-43-2:www ESTABLISHEDtcp 1 1 ramesh-laptop.loc:42367 101.101.34.101:www CLOSING
^C
Find the non supportive Address families in your system
netstat --verbose
At the end, you will have something like this.
netstat: no support for `AF IPX' on this system.netstat: no support for `AF AX25' on this system.netstat: no support for `AF X25' on this system.netstat: no support for `AF NETROM' on this system.
Display the kernel routing information using netstat -r
# netstat -rKernel IP routing tableDestination Gateway Genmask Flags MSS Window irtt Iface192.168.1.0 * 255.255.255.0 U 0 0 0 eth2link-local * 255.255.0.0 U 0 0 0 eth2default 192.168.1.1 0.0.0.0 UG 0 0 0 eth2
Note: Use netstat -rn to display routes in numeric format without resolving for host-names.
Find out on which port a program is running
# netstat -ap | grep ssh(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)tcp 1 0 dev-db:ssh 101.174.100.22:39213 CLOSE_WAIT -tcp 1 0 dev-db:ssh 101.174.100.22:57643 CLOSE_WAIT -
Find out which process is using a particular port:
# netstat -an | grep ':80'
Show the list of network interfaces
# netstat -iKernel Interface tableIface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flgeth0 1500 0 0 0 0 0 0 0 0 0 BMUeth2 1500 0 26196 0 0 0 26883 6 0 0 BMRUlo 16436 0 4 0 0 0 4 0 0 0 LRU
Display extended information on the interfaces (similar to ifconfig) using netstat -ie:
# netstat -ieKernel Interface tableeth0 Link encap:Ethernet HWaddr 00:10:40:11:11:11 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Memory:f6ae0000-f6b00000
Reference
http://www.thegeekstuff.com/2010/03/netstat-command-examples/
http://www.computerhope.com/unix/unetstat.htm
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