FusionHub firewall logs details meaning

I have enabled firewall rules on my fusionhub to log unwanted traffic and I got this:

I see DNS traffic from one of guest networks (192.168.100.0) to my dns server. I don’t want guest networks to use this dns. I suppose that one of my guest networks is configured incorrectly and pointing to wrong dns. How can I find which peplink device is it? I can see that dns is comming from IN=vpn0000BA0001 but how can I find VPN connection using this id?