Penetration Testing mailing list archives

Re: IP Spoofing/Masquarading


From: James Bensley <jwbensley () gmail com>
Date: Wed, 9 Sep 2009 09:11:36 +0100

2009/9/9 M.D.Mufambisi <mufambisi () gmail com>:
I understand that IP packets can be spoofed ie change the source
address to make it look like they originated from the internal LAN.
However, when this is done across the internet, with a private IP
address in its source field, how does this packet get routed through
the internet?

Kind Regards


It doesn't, private IP addresses aren't routed, when the local packet
hits the edge of your local LAN and exists via a router for example it
will be NAT'ed and/or PAT'ed so it won't have the local address as the
source IP otherwise how would the response ever get back to the
source?

Ted Turner  - "Sports is like a war without the killing." -
http://www.brainyquote.com/quotes/authors/t/ted_turner.html

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