Hello,how we can make HA between two GTM boxes at the same datacenter

Amr_Ali Do you mean having an HA device much like you have HA LTMs? If that's a yes you really don't have to do that because GTMs are inherently redundant for DNS because of how the sync works between them for DNS configuration. You might need them to be HA because they run multiple functions such as GTM, LTM, AFM, and so on but you should try and keep GTM off of the same box as those other services if possible.

I agree with Paulius 100%. If the F5 BIG-IPs only running GTM as dedicated module, no need for HA! Use GTM sync group and publish both listener addresses for DNS... or setup DNS anycast. If in HA, you don't have BOTH units responding to DNS (normal setup), but if both are standalone and part of the same GTM sync group, then you still have resiliency and depend on iQuery between both GTM instances and DNS for failover. If running more modules... like LTM and/or ASM the conversation changes. Most clients with run dedicated smaller devices for GTM/DNS only, and a bigger device for all other ADC functions.

If this is a GTM what other configuration are you referencing? If you have the GTM in the sync group it will replicate all GTM configuration between the GTM devices in the sync group, less their unique configuration such as self-IPs, routes, and so on.

hello whisperer, I need to make HA between two GTM boxes at the same location ( datacenter ) not in different locations

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