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Old 06-28-2006, 05:16 AM   #1
Registered: Mar 2006
Distribution: Debian
Posts: 105

Rep: Reputation: 26
Check Open Ports on DHCP Server

I connect to the internet through the DHCP server of my student dormitory. Unfortunately, they have blocked many ports like the one for aMule (TCP 4662). I have tried some other ports to use aMule with but all were blocked so I guess only few ports are permitted. How can I check which ports are allowed by the DHCP server?

Old 06-28-2006, 06:11 AM   #2
Senior Member
Registered: Sep 2005
Location: France
Distribution: LFS
Posts: 1,591

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The DHCP server is the server which assigns ip addresses. The NAT or the firewall is what is blocking ports.
Anyway, you should use nmap for port scanning.
If you are able to surf the web, (like, that means the port 80 is open.

Have fun.
Old 06-28-2006, 07:08 AM   #3
Registered: Jun 2005
Location: On the top of the World
Posts: 114

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ofcourse nmap is the best

nmap x.x.x.x (ipaddress of machine to be scanned)

or if you want to save the output of this command into a file then you can use it like:-

nmap x.x.x.x > filename


Harinder Singh
Old 07-06-2006, 01:50 PM   #4
Registered: Mar 2006
Distribution: Debian
Posts: 105

Original Poster
Rep: Reputation: 26
Thanks guys, that was exactly what I needed


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