> # pfctl -sr
> pass all flags S/SA
> pass in on pppoe0 inet proto tcp from <src> to <dst> port = 5555 flags S/SA 
> synproxy state
> 
> This is the only rule. Otherwise it's just 'pass all'. If I remove this
> rule too *or* change synproxy to keep, the connection is working.
>

I remember being puzzled by that myself. I thought I had got it working
but I'm struggling to be sure now whether I got it working or switched
synproxy off on that machine, sorry.
 
> I can reproduce this on two different machines, with different ISPs and
> different NICs facing the ISPs using pppoe.

Is it possible or have you tried the NIC that it works on in pppoe mode.

-- 
_______________________________________________________________________

'Write programs that do one thing and do it well. Write programs to work
together. Write programs to handle text streams, because that is a
universal interface'

(Doug McIlroy)
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