Security Basics mailing list archives
Re: IP Spoofing/Masquarading
From: "M.D.Mufambisi" <mufambisi () gmail com>
Date: Wed, 9 Sep 2009 11:26:37 +0200
Marco, Thank you very much for the clarity. I had confused things. Source field is not used for routing. I had missed that. Thanks. On 9/9/09, Marco Ivaldi <raptor () mediaservice net> wrote:
On Wed, 9 Sep 2009, M.D.Mufambisi wrote: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?The source field is not relevant to IP routing, only the destination is. I strongly suggest you to read "TCP/IP Illustrated Vol. 1" by W. Richard Stevens [1]. On the other hand, if proper egress filtering [2] is in place, you'll have trouble spoofing the source address of the packets leaving your network. [1]. http://books.google.com/books?id=-btNds68w84C&lpg=PA37&ots=e-u0USRsms&dq=ip%20routing%20stevens&pg=PA37#v=onepage&q=&f=false [2]. http://en.wikipedia.org/wiki/Egress_filtering Hope this helps, -- Marco Ivaldi Lead Security Analyst Data Security Division @ Mediaservice.net Srl http://mediaservice.net/
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Current thread:
- IP Spoofing/Masquarading M.D.Mufambisi (Sep 11)
- Re: IP Spoofing/Masquarading Samuel Korpi (Sep 11)
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- Re: IP Spoofing/Masquarading M.D.Mufambisi (Sep 11)
- Re: IP Spoofing/Masquarading Sebastiaan (Sep 11)
- Re: IP Spoofing/Masquarading M.D.Mufambisi (Sep 11)
- Re: IP Spoofing/Masquarading Robert Portvliet (Sep 11)
- Re: IP Spoofing/Masquarading Marco Ivaldi (Sep 11)
- Re: IP Spoofing/Masquarading M.D.Mufambisi (Sep 11)
- Re: IP Spoofing/Masquarading Jack Carrozzo (Sep 11)
- RE: IP Spoofing/Masquarading David_Falloon (Sep 11)
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- Re: IP Spoofing/Masquarading M.D.Mufambisi (Sep 11)
- Re: IP Spoofing/Masquarading Brad Edmondson (Sep 11)
- Re: IP Spoofing/Masquarading Fabien Vincent (Sep 11)
- Re: IP Spoofing/Masquarading M.D.Mufambisi (Sep 11)
- Re: IP Spoofing/Masquarading matteo filippetto (Sep 11)
- Re: IP Spoofing/Masquarading Gerardo Castillo Alvarado (Sep 11)
- Re: IP Spoofing/Masquarading Chris Brenton (Sep 11)
- RE: IP Spoofing/Masquarading Erik Soosalu (Sep 11)
- Re: IP Spoofing/Masquarading Gerardo Castillo Alvarado (Sep 11)