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Cisco router - check for open ports

Hi There,

We currently have a Cisco 1841 router and it only accessible via telnet and we are in the process of upgrading this router and was wanting to know if anyone was able to tell me the entire command line commands to run on this router in order to find all currently open ports?

Thanks in advance
Adrian

Ernie Beek

Well you should be able to see that in the config. So use show run or show start. All ports not explicitly defined in the access lists should be closed.

SOLUTION

SuperTaco

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Ernie Beek

You can always double check by using something like shields up : https://www.grc.com/x/ne.dll?bh0bkyd2

ASKER CERTIFIED SOLUTION

Istvan Kalmar

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Ernie Beek

@ikalmar: it that just like a netstat -an ?

SuperTaco

yes, very similar. I didn't recommend it, because i usually like using scanning tools. either way will work though.

Ernie Beek

Cool, didn't know that one. Had my learning experience for today :)

Adma1

ASKER

Thanks everyone for your responses,

Ikalmar: when I run the sh ip sockets command I receive the following error

'xxxx'-GW0#sh ip sockets
^
% Invalid input detected at '^' marker.

is there a series of commands that I need to run prior to the sh ip sockets command?

Thanks,
Adrian

SOLUTION

tirabytes

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