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Date:	Mon, 21 May 2007 13:13:43 -0700
From:	Andrew Morton <>
Cc:	Patrick McHardy <>,
Subject: Re: [Bugme-new] [Bug 8519] New: NAT prerouting over tun interface

On Mon, 21 May 2007 13:05:36 -0700 wrote:

>            Summary: NAT prerouting over tun interface broken
>     Kernel Version:
>             Status: NEW
>           Severity: normal
>              Owner:
>          Submitter:
> Most recent kernel where this bug did *NOT* occur:
> Distribution: Debian unstable
> Hardware Environment: EM64T (Pentium D) running amd64 kernel
> Software Environment: Debian unstable
> Problem Description:
> I have the hercules s/390 emulator running on an EM64T host, both running 
> Debian unstable. I use a tun interface, a second IP address on eth0 and 
> iptables/nat so the emulator has it's own address on my local network.
> With on the host, networking between the emulator and the host system 
> is fine (I can ssh from the host into the emulator without problems), but 
> communication from the emulator with other boxes is broken. Other boxes also 
> don't see the emulator if I ping its external address.
> If I ping another box on my LAN from the emulator while running wireshark on 
> the host, I can see that:
> - the echo request gets sent OK
> - the other box replies OK
> - the host receives the echo reply
> - but the tun interface never gets it.
> If I boot the host with 2.6.20 everything works fine again.
> Here is how the setup looks:
>         |---------------- host system --------------------|
>                                            |-- emulator --|
>             eth0              tun              ctc0
>  LAN  <--->   
>  LAN  <---> <---> <--->
>                          nat              P2P
> The only active iptables rules are:
> iptables -t nat -A PREROUTING -d \
>          -j DNAT --to-destination
> iptables -t nat -A POSTROUTING -s \
>          -j SNAT --to-source
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