Here are some things to test:
https://www.networkworld.com/article/2231682/cisco-subnet/cisco-subnet-allow-both-tcp-and-udp-port-53-to-your-dns-servers.html
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Here are some things to test:
https://www.networkworld.com/article/2231682/cisco-subnet/cisco-subnet-allow-both-tcp-and-udp-port-53-to-your-dns-servers.html