What is a good software to check the ports on our router?

I need a good free software that will scan the ports of our ISP router. They are claiming certain ports are open but I think they are closed. Any suggestions and how to would be helpful.
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JRome225Asked:
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serialbandCommented:
nmap is a relatively easy to use command line tool for port scanning.  http://nmap.org/download.html

You can also use netcat and superscan http://www.thenetworkadministrator.com/netadmintools.htm
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JohnBusiness Consultant (Owner)Commented:
You can also do a live scan of the external IP address of this router at grc.com. That is another helpful source.
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