RegularSizeRoss
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RegularSizeRoss's post in "Destination unreachable (Port unreachable)" packets for DNS was marked as the answerJust going to post this here in case anyone runs into a similar issue.
What I did to fix this was to force --dns=10.0.117.1 on the Docker container.
I believe the issue is that my DNS server on my OPNSense router was listening on all interfaces, including the VLAN interface, and it was replying from both the default interface address and the VLAN interface, so I was getting a duplicate response which was causing issues.
Originally I had only tried forcing --dns=10.0.17.1 (the DNS of my main LAN) and that wasn't working, I didn't think to try the gateway of the VLAN instead, but that was the solution for me.