A vulnerability scan of Peplink devices has revealed that TCP port 53 is enabled

[MartinLangmaid]

I assume you are using inbound load balancing as that’s the only logical reason for a Peplink to present port 53 on its WANs without manual port forwarding enabled…

Understanding Inbound Load Balancing

Inbound Load Balancing distributes inbound data traffic over multiple WAN links to computers/servers behind Peplink Balance. Peplink Balance 210, 310, 305, 380, 580, 710, and 1350 have a built-in DNS server that enables this functionality. Built-in DNS server functionality is not available on Peplink Balance 20 and 30. Inbound Load Balancing is configured via both of the following: DNS records configured within Peplink Balance All the records of the domain (A, MX, CNAME, TXT, etc) will be h…