DNS Fasttrack and security

RouterOS Wireless Networking
1

/ip firewall filter
add action=fasttrack-connection chain=forward comment=“Fasttrack UDP” dst-port=53 in-interface=all-ppp protocol=udp
add action=fasttrack-connection chain=forward comment=“Fasttrack TCP” dst-port=53 in-interface=all-ppp protocol=tcp

I am considering applying fasttrack dns to PPPoE connections in /ip firewall filter on the core router of our network but my concern is that a bad idea
from a security point of view as regards DDoS attack, can anyone advise on this?

2

DNS is only tiny bits of information so not much to gain by fasttracking it.

Why should it be a DDoS. It are responses to your resolve requests and so statefull. Fasttrack should inspect the first package and time to time also packages in the stream.
DNS exists in one or two packets returning so Fasttracking those is useless.

Looking from your side it is also useless to fasttrack this traffic.