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How to set up a DNS cache server without port 53

rated 0 times [ 1] [ 0] / answers: 1 / hits: 992 / 2 Years ago, sat, october 8, 2022, 5:07:27

my country, indonesia, is attempting to take over DNS functions in all the ISPs here.

thousands of sites including reddit, vimeo, and even (sometimes) github are blocked.

now this would not be so bad if the replacement DNS servers functioned properly and quickly. but they don't.

they are extremely slow and they seem to take a long time to update new entries.

i am running ubuntu servers (14.04) in my company. is it possible to set up a DNS cache server on my LAN which can be updated without using port 53? or without being intercepted by my ISPs?

if you have an answer, please explain slowly using big letters, as DNS issues always confuse me.

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giccolla

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3 Years ago

answered 2 Years ago enincroscope · Accepted Answer

If your ISP (or your government) is intercepting your outgoing connection to port 53 then one thing you can do is set up a VPN to a server outside your country and route the DNS traffic through it. It will cost you a few $/month though. If this is an option search the net for "VPN servers". Don't be tempted to use a free VPN, DNS is way too important to depend on an unreliable and slow free VPN.

Update

Yes, the connection to the VPN could be slow and/or disrupted at times. You have to balance that against the slow/disrupted connection to the DNS server provided by your ISP. Sorry, can't tell you which solution would be worse, you will have to figure it out yourself.

"if a DNS caching server was set up on the VPN, could i set up another caching server on my local LAN which took it's updates from the VPN's DNS cache?" - yes, that is pretty much what I would do. Note that you have no control over what DNS server is set up at the VPN server but this can be part of your selection criteria for VPN providers.