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T0nyP's avatar
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Apr 01, 2022

F5 DNS what specific TCP/UDP port need to open?

Hi F5 Community,

We are restricting thru Port Lockdown our F5 DNS system which is facing Internet.

Does UDP/53 and TCP/4353 already enough?

Or we still need to open both TCP/UDP 53 and TCP/UDP 4353?



1 Reply

  • Hi

    So i think if you would like to enable about security DNS or zone transfer, You have to open TCP 53 and TCP 4353 for protocol IQUERY


    Thanks you