f5 GTM: Resolve to Internal or External address based on client

Question

Hi there&nbsp;
We have a split dns domain, hosted on an internal only server and externally on a f5 GTM (internet facing).&nbsp;
Does anyone know if it would be possible for the GTM to return a different address based on the client (ip) making the request?&nbsp;
So depending on the IP address of the machine making the query I would like the GTM to return a different IP address.&nbsp;
Could this be achieved hypnotically using an iRule? if so then if anyone has an example that would be great.&nbsp;
Thanks in advance&nbsp;

greg_labelle · Answer

You won't need an iRule for this.  GTM leverages Topology rules to allow for responding in this fashion.&nbsp;
https://support.f5.com/kb/en-us/products/big-ip_gtm/manuals/product/gtm-topology-lb-configuring-11-0-0/1.html&nbsp;
Configure your topology rules to direct all internal (controlled) ip subnets to the internal DNS, and fallback to the external for all others.&nbsp;

shiraz · Answer

Greg gave you the Answer and to add it, there is a solution article from F5 for split DNS which is achievable using different methods which also includes topology based load balancing....&nbsp;
Here is the article:&nbsp;
Achieving split DNS behavior through BIG-IP GTM wide IPs&nbsp;
https://support.f5.com/kb/en-us/solutions/public/14000/400/sol14421.html&nbsp;
Regards,&nbsp;
Mohammed Shiraz Mukram&nbsp;

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f5 GTM: Resolve to Internal or External address based on client

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