closing port 22

Unanswered Question
Jun 27th, 2004
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Ey there, very ease question, but i just dont know how to do it.

I need to close port 22 on a cisco router, what command do i need to do this?

And is there a way to see what ports are open?

Thank you!

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3cayers Mon, 06/28/2004 - 09:06
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If you are running an SSH version of IOS and want to disable SSH on the router itself, you will need to remove "transport input ssh" from your line config.

conf t

line vty 0 4

transport input telnet

If you have a machine behind the router and want to disallow port 22 access to this machine, you will need to create an extended IP access-list and apply it.

conf t

access-list 199 deny tcp any any eq 22

access-list 199 permit ip any any

int f0/0 (connection to internet)

ip access-group 199 in


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