Testing Available Ports

[Doug]

I want to be able to connect to different computers at home but I have discovered that if I open port 22 in my router and forward it to several computers only the first one on the list gets the connection. If that computer does not respond the connection does not go on to the next one in the list, it simply fails. So I want to change the SSH port for various computers. The problem is the computer I am connecting with is behind a stateful firewall so all ports are shown as closed when scanned from the outside. Thus I need some kind of scanner utility that works from inside the firewall to outside and tells me which ports the firewall permits SSH connections on. Does anyone know of such a thing?

[Mark Cohen]

google : nmap

On Mar 11, 2013, at 7:16 PM, Doug <dougla...@gmail.com> wrote:

I want to be able to connect to different computers at home but I have discovered that if I open port 22 in my router and forward it to several computers only the first one on the list gets the connection. If that computer does not respond the connection does not go on to the next one in the list, it simply fails. So I want to change the SSH port for various computers. The problem is the computer I am connecting with is behind a stateful firewall so all ports are shown as closed when scanned from the outside. Thus I need some kind of scanner utility that works from inside the firewall to outside and tells me which ports the firewall permits SSH connections on. Does anyone know of such a thing?

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[Doug]

I actually ran across nmap in my searches but didn't think it was what I needed. I have installed it now and it shows port 21 for FTP, 80 for HTTP, 443 for HTTPS, and others, about 8 altogether. The strange thing is it doesn't show port 22 as being available for SSH, even though I can use it. But judging by the other results, even if I can get it to show me SSH I highly suspect port 22 will be the only one on which it works.

Thanks for the help.