Forum Discussion

T0nyP's avatar
T0nyP
Icon for Cirrus rankCirrus
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?

Thanks,

Tony

application delivery
dns
  • T-Trust's avatar
    T-Trust
    Icon for Cirrostratus rankCirrostratus
    Apr 02, 2022

    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