RE: IP Spoofing/Masquarading

["Erik Soosalu" <eriks () nationalfastfreight com>]

I suggest you read the RFC:

" and packets with private source or destination addresses
   should not be forwarded across such links.  Routers in networks not
   using private address space, especially those of Internet service
   providers, are expected to be configured to reject (filter out)
   routing information about private networks. If such a router receives
   such information the rejection shall not be treated as a routing
   protocol error."

Should not be forwarded != cannot be forwarded.

Remember that the same gear that is used by an ISP is used by
Enterprises.  Routers, firewalls, etc, need to be able to route the
private address space IPs as there is always a business reason to do so.

Thanks,
Erik

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of aditya mukadam
Sent: Wednesday, September 09, 2009 5:04 AM
To: M.D.Mufambisi; pen-test () securityfocus com; security-basics
Subject: Re: IP Spoofing/Masquarading

Private IPs (as per RFS 1918) cannot be routed over internet.

Thanks,
Aditya Govind Mukadam


On Wed, Sep 9, 2009 at 11:49 AM, M.D.Mufambisi <mufambisi () gmail com>
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?
>
> Kind Regards
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