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closing port 22

middee
Beginner
Beginner

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!

1 REPLY 1

3cayers
Beginner
Beginner

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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