Land Protection for Cisco

Fri Nov 21 18:58:22 UTC 1997

snippet from bugtraq:
----
hi.
Here is a simple protection against the land stuff for the cisco's. It's a 
extended ip access list that should be put on all the intefaces on the 
box.

Extended IP Access list 105 
deny tcp host 111.111.111.111 host 111.111.111.111 
permit ip any any
where 111.111.111.111 is the interface's ip address. This should be put 
as 
an input access-group.
Or if you don't get it here's what to type on your cisco's console.
rtr#config terminal 
rtr(config)#access-list 105 deny tcp 111.111.111.111 0.0.0.0
111.111.111.111 0.0.0.0 
rtr(config)#access-list 105 permit ip any any 
rtr(config)#interface ethernet 0 
rtr(config)#ip access-group 105 in 
rtr(config)#exit 
rtr(config)#interface serial 0 
rtr(config)#ip access-group 105 in
and so on for the rest of the interfaces... Replace 105 with a free 
extended access-list number.
I have tested it on our cisco 2511 and it works just ok.

- -- ---------
Ken Harris 			[( ken at drummerweb.com )]
Drummer Associates 	[( www.drummerweb.com )]

"Education is what remains after one has forgotten 
everything learned in school"  -Albert Einstein
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