How to detect opened TCP/IP ports in HP-UX

[yc_2]

Hi,

Is there a way to detect opened TCP/IP ports in HP-UX besides using a scanner?

Any pointer is appreciated.

[Joseph Loo]

hi,

if u mean ports that are listening, u may do this:

# netstat -an|grep tcp|grep LISTEN|sort

regards.

[yc_2]

It works on tcp ports.

What about capturing udp ports that listening?

[Joseph Loo]

netstat -an|grep udp

regards.

[Biswajit Tripathy]

While the previous posts tell you how to findout which
ports are open, there is an interesting fact that you
should know.

If you are running HP-UX IPFilter firewall to block
certain ports, those ports will still be shown in LISTEN
state by "netstat -an" command even if they are
blocked in a sense that no remote system would be
able to access them. The reason being, IPFilter
firewall operates at a point much lower in the
networking stack than where "netstat -an" gets it's
information from.

- Biswajit