Can DNS be passed over a site to site PPTP VPN tunnel?
Posted on 2009-12-30
I have a site to site VPN setup using PPTP and for some reason I can't query a DNS server in the remote location. Both sides of the connection can ping each other by IP address, I can connect to TCP ports across the VPN link. Only DNS doesn't seem to work. This one has me baffled. There are no firewall rules to stop this. If I setup a netcat listener on UDP or TCP port 53 and try to connect to it from a system across the VPN it works fine. It just seems like DNS queries get blocked.