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NAT and Source Address

Posted on 2008-11-16
Medium Priority
Last Modified: 2013-12-25
Say I want to block a website at If I am using NAT on my network how would I define that traffic? What would the source addres be?  Would I have to block with a firewall or access list before the traffic is NATed?
Question by:jlgray48

Assisted Solution

tibble2 earned 1000 total points
ID: 22971776
on external router interface create a deny ip access list and on the internal router creat a loopback adapter and point all internal traffic to this address.

this will break communication in both directions.

LVL 18

Accepted Solution

exx1976 earned 1000 total points
ID: 22974924
If users are accessing it via DNS name (like for HTTP/s or FTP) then simply make a bogus A record and blackhole it...    Easier than messing with routers..

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