netstat quick reference

Display all LISTENING tcp ports

# Netstat -ntlp

To swtich the name resolution off use

# netstat -tlp

Display all LISTENING udp ports

# netstat -ulp

To see established tcp connections

# netstat -tp

To find out who has connected through ssh

# netstat -ntp|grep :22

or

# netstat -tp|grep :ssh

Displaying the routing table

# netstat -r

or

# netstat -rn