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how to open a specific port

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Operating Systems Solaris how to open a specific port
# 1  
Old 08-21-2009
how to open a specific port
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  
Old 08-21-2009
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  
Old 08-21-2009
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  
Old 08-21-2009
To test a port try telnet or ping
example test port 25:
Code:
ping -p 25 [address]
telnet [address] 25

# 5  
Old 08-21-2009
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  
Old 08-22-2009
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  
Old 08-22-2009
Turn off the firewall or at least re-enable that port on the firewall rules.
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