how to open a specific port

UNIX Solaris
1

Hi All,

Can anyone let me know that how to open a specific port in Solaris 10. I just wanted to know if there are some certain commands to open a port (like ftp, telnet).

It would be also better if someone can tell me if there is another firewall service in Solaris 10 except ipfilter.

Thanks,
Deepak

2

A port is open when the service listening on it is enabled.

Ipfilter work well. There might still be commercial firewalls available like CheckPoint.

3

If you want to open your own port using your own program, read about TCP/IP api and create your own daemon.

If you just want an application to listen on a port you can configure Inetd to listen on specific port for you. check /etc/inetd.conf

4

To test a port try telnet or ping
example test port 25:

ping -p 25 [address]
telnet [address] 25
5

I'm afraid the "ping -p" suggestion won't work as ping isn't designed to probe ports.
The -p option is about UDP port, not TCP ones.
This option is ignored unless the "-U" option is set.
Ping will report the remote host to be alive regardless of the UDP port being open or not anyway.

6

Yes, I agree.
When any service is enabled, the service starts listening on it's specified port untill there is no firewall turned on. But when the firewall is turned on, how to open a port of any service so that the request regarding that could be listen.

Thanks,
Deepak

7

Turn off the firewall or at least re-enable that port on the firewall rules.