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JBonnet's avatar
Icon for Nimbostratus rankNimbostratus
Nov 30, 2022

F5 GTM Subdelegation

I am practicing sub delgeation exercise in the lab, in my DNS server I am delegating subdomain to the F5 devices, current zone file for

$TTL    604800

@       IN      SOA (
                 57     ; Serial
                900     ; Refresh 15 mins
              86400     ; Retry
            2419200     ; Expire
             604800 )   ; Negative Cache TTL

; name servers - NS records
                        IN      NS
                        IN      NS
; name servers - A records         IN      A         IN      A       IN CNAME       IN NS       IN NS  IN      A  IN      A

In the F5 GTM device I created a wideip - - this works returning the relevant A record.

Now I noticed when I created this, a zone was created in zonerunner ""  which creates a default NS/SOA and A record (pointing to

What is the correct process that must be done further? since any NS queries etc which are polled to the GTM respond with ""

- should I update zonerunner with the subdomain zone records, I tried to do this from but adding a second nameserver in the zone failed  (
- or should I create a primary/secondary nameserver on the GTM's for the subdomain?

Thank you in advance

1 Reply

  • xuwen's avatar
    Icon for Cumulonimbus rankCumulonimbus

    The existing SOA and NS records of the zone under the zonerunner will not be overwritten by the above operations. I recommend you to delete the wideip and then delete zone under zonerunner
    Finally, modify the SOA and NS record values of the zone automatically generated by wideip:
    modify gtm global-settings general wideip-zone-nameserver
    After the above steps are completed, you can create a wideip, and then observe the SOA and NS records whether change to

    and create a another wideip, and under the ZoneRunner zone 

    its NS and SOA will also be

    Tips: low version in GTM, such as V12, wideip create zone default SOA and NS value is F5 hostname