Is there a way to forward packets even if no TCP SYN was detected
before ?

A packet (TCP SYN) is sent to a unit but the reply (TCP SYN ACK) goes
through another route and then through Shorewall.  The firewall sees
that there was no prior TCP SYN and does not forward the packet.

Cisco handles that situation with Access Lists.  Is there a Shorewall option
that would let this type of flow go through ?

Thanks.

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