netdev - Old Mobile-IP code and modern Linux

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Message-ID: <1317994044.53022.YahooMailNeo@web161201.mail.bf1.yahoo.com>
Date:	Fri, 7 Oct 2011 06:27:24 -0700 (PDT)
From:	Joerg Pommnitz <pommnitz@...oo.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Old Mobile-IP code and modern Linux

Hello all,
I'm trying to run the old dynamics Mobile IP implementation (see http://dynamics.sourceforge.net/) on a modern Linux kernel (Fedora 15 2.6.40 aka 3.0).
There seems to be a problem in the communication between a mobile node and the foreign agent. The mobile node sends UDP packets with a source address from its own home network to the discovered address of the FA. Unfortunately the FA never sees these packets. It seems that packets with an unexpected source address will be discarded (ingress filtering?). Is there a way to disable this behavior? What is the right way to implement MobileIP on a recent Linux kernel?

Thanks in advance
  Joerg

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