netdev - Re: [PATCH 1/9] netfilter: nf_nat: support user-specified SNAT rules in LOCAL

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Date:	Fri, 2 Jul 2010 12:14:06 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	kaber@...sh.net
cc:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 1/9] netfilter: nf_nat: support user-specified SNAT rules
 in LOCAL_IN


On Friday 2010-07-02 11:52, kaber@...sh.net wrote:
>
>2.6.34 introduced 'conntrack zones' to deal with cases where packets
>from multiple identical networks are handled by conntrack/NAT. Packets
>are looped through veth devices, during which they are NATed to private
>addresses, after which they can continue normally through the stack
>and possibly have NAT rules applied a second time.
>
>This works well, but is needlessly complicated for cases where only
>a single SNAT/DNAT mapping needs to be applied to these packets.

I still have not grasped why SNAT is needed in the INPUT path. For the
tunnel scenario that you wanted to build I could not find a reason to
do SNAT in that place - since the non-encapsulated packets don't go
through INPUT anyway.
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