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Although being somewhat experienced in setting up P2P OpenVPN on OPNSense for some reason this time I can only get traffic 1-way. It's been a while since I've done this so I've probably missed something.

Meaning, Site A LAN cannot reach Site B's LAN, even though Site B's LAN CAN reach Site A's LAN.

The OpenVPN firewall rules are set up the same on both sites: IPv4* Allow everything from everything to everything.

Protocol    Source    Port    Destination Port   Gateway
IPv4 *    *    *    *    *    


OpenVPN Server Settings: (Site A)

Tunnel Net: 172.16.12.0/24
Local Net: 192.168.55.0/24
Remote Net: 192.168.54.0/24


OpenVPN Client Settings: (Site B)

Tunnel Net: 172.16.12.0/24
Remote Net: 192.168.55.0/24

There are no LAN rules on the Site B OPNSense other than the default LAN4/6 to Any.