Massive outgoing UDP traffic port 53

[whplus]

During recent days I received a massive increase in outgoing UDP traffic port 53. My server connection is going very slow.

How do we resolve the problem?
Should we block outgoing UDP port 53 requests? What's the implication?

Fyi this is cpanel server 11.26.20 with external DNSOnly server.

Your advice will be greatly appreciated.

Thank you very much.

[inetbizo]

From /etc/named.conf

include "/etc/rndc.key";

controls {
    inet 127.0.0.1 allow { localhost; } keys { "rndc-key"; };
};
zone "." {
        type hint;
        file "/var/named/named.ca";
};

acl "trusted" {
127.0.0.1;
LIST YOUR NOC NS IPs HERE <===
LIST YOUR OWN NS IPs HERE <===
10.20.9.0/24;
};

options {
   allow-recursion { trusted; };
   version   "<HIDDEN>";
};

ACL's in bind are access control list