[strongSwan] had to manually up a connection

Victor Sudakov vas at sibptus.ru
Mon Mar 9 05:12:06 CET 2020

Tobias Brunner wrote:
> > I see that the first packet in matching
> > traffic is always lost: in a ping session, packet with seq=1 never makes
> > it to the other side, only from seq=2 onwards.
> > 
> > Why does this happen?
> It's a known property of the Linux kernel.  Packets, in particular the
> triggering one, are not cached and lost until the IPsec SAs are established.
> > and is there a way to avoid it?
> Not that I'm aware.

Maybe using "auto=start" would be better in this scenario? When the
host wants to send an SNMP trap, the IPSec connection will have already
been established. No need for triggering.

Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49 at fidonet http://vas.tomsk.ru/
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