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My Comcast internet connection has been giving problems in DNS resolution, and I am guessing the reason is a probably broken or limited UDP. I am currently working around it by tunneling over TCP through a VPN, but to get the IP address of the server hosting the VPN I had to do a dig @8.8.8.8 +tcp <hostname>.

I am wondering if there is a configuration to enforce DNS resolutions over TCP instead of UDP?

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https://github.com/henices/Tcp-DNS-proxy (not tested)

Something like that should work?

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