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From: Sven Eckelmann <sven.eckelmann@gmx.de>
Date: Mon, 16 Aug 2010 18:32:13 +0200
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Subject: Re: [B.A.T.M.A.N.] Nat Question
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To: b.a.t.m.a.n@lists.open-mesh.org
Cc: David Beaumont <djb31st@gmail.com>

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David Beaumont wrote:
> Sorry for the late reply, a few things came up over the weekend that i
> had to attend to.
>=20
> Here are three tcp dump files from the internet node on bat0 and one
> on eth1 (the internet port)
>=20
> Really don't understand what is wrong here :-(

Ok, test plan:

 * Find the machine and interface were a response from google.com could be
   received but which will not forward it to the other interface
 * take a real dump on all interfaces (wan and lan)
   tcpdump -s 0 -i eth1 -w eth1.dump
 * when the response packet is forwarded over the lan/bat0 interface but
   doesn't get to the final machine than please also create a tcpdump on the
   receiving machine (real interface and maybe bat0)
 * Go to your router and check mtu of your wan interface
 * Try to ping google.com with the maximum size (mtu - 28 bytes, for exampl=
e=20
   mtu 1492): ping -M do -s 1464 google.com
 * Send small tcp packet with small tcp response:
   echo "HEAD / HTTP/1.1\nHost: git.open-mesh.net\n\n"|nc git.open-mesh.net=
 80

Best regards,
	Sven

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