DNS Flag Day 2020: DNS servers must support both UDP and TCP queries

From zdnet.com

DNS Flag Day

An industry group of the world’s biggest DNS service providers has agreed on a plan to improve the state of the DNS ecosystem by forcing certain configuration changes upon the smaller server operators that are affecting the speed and performance of the entire internet.

According to this group, starting with February 1, 2020, DNS servers that can’t handle DNS queries over both UDP and TCP may be pushed out of the DNS ecosystem and stop working.

The idea is to get DNS server operators to update their server software and configurations and ensure their servers can handle DNS queries received as either UDP or TCP packets.

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