HOW TO CHECK TCP CONNECTION IN LINUX

############ HOW  TO CHECK TCP CONNECTION WITH PID  #############

  netstat -A inet  -p

[root@station ~]# netstat -A  inet -p

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0     52 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

[root@station ~]#

## TO CHECK ONLINE CONNECTION ###############

Command:    netstat  -A inet  -p  -c

[root@station ~]# netstat -A  inet -p  -c

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0     52 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0    196 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 station.example.com:ssh     192.168.194.1:51680         ESTABLISHED 6658/sshd

tcp        0      0 station.example.com:40538   63-150-12-26.dia.stati:http ESTABLISHED 3710/clock-applet

tcp        0      0 station.example.com:21064   192.168.194.173:55170       ESTABLISHED -