From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pablo Neira Ayuso <pablo@netfilter.org>
Subject: Re: Flowtable with ppp/bridge
Date: Mon, 26 Apr 2021 19:57:03 +0200
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To: Frank Wunderlich <frank-w@public-files.de>
Cc: netfilter@vger.kernel.org

On Mon, Apr 26, 2021 at 07:51:11PM +0200, Frank Wunderlich wrote:
> Hi Pablo,
> 
> Is alex' guess right and i need to use physical interface instead of
> the virtual one?

Confusing, you reported an example that works:

http://forum.banana-pi.org/t/new-netfilter-flow-table-based-hnat/12049/30

That was in March 2021.

> In my case i have ppp connection over vlan on wan port.
> 
> ppp8 => wan.110 => wan
> 
> Lan side (bridge) may work,but for ppp it sounds wrong to me.

Just add the 'wan' device to the flowtable, as you did back in March.