Wireguard: IPv6 issues, IPv4 is working fine

[haiflo]

Good morning,

some days ago i switched from a openwrt device to a opnsense vm.

I am using that firewall as a dns, dhcp and wireguard server. It is integrated into my local subnet and is connected with the lan port to my fritzbox. So it has not the function as a firewall directly.

Unfortunately wireguard has some issues with ipv6 connections. IPv4 connections are working fine. They are nated from my fritzbox over port 1194 to my opnsense. But if i try to connect over ipv6 to my wireguard server there is no handshake possible. BUT: I can see traffic on the wireguard interface(received and sent) and i notice data incoming from my client devices with wireshark and tcpdump. Ping and HTTPS from that devices are working fine, so i dont think that is a generel problem with ipv6.

At the moment i have no clue why it is not working probably.

Maybe you have got an idea how to solve that problem.

Thank you so far for your support. :)

With the best regards

Flo