Reason for blocking is corporate policy is to allow dns requests from internal DNS servers only. Also, they both create security risks that could allow tunneling of malicious traffic and also could potentially bypass your security policies
Palo Alto also recommends blocking.
You don't believe they should be blocked? I'd like to hear your reasons
@ce1028 i do believe in blocking them, but under the right circumstances
my first preference is to block all outbound DNS except the outbound connections from my inhouse DNS server for which i would force tls/https as much as possible (for privacy reasons)
in a second scenario, if there is no internal DNS i would encourage dns-over-tls/https as this provides more privacy
from the firewall you can ssl decrypt to still look inside and make sure there are not threats, but an outside listener should not be able to pick up on my dns traffic
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