GTM gives "no such name" reply
Customer plans to move proxy service that is hosted on a server (private IP 10.1.1.1) to another new physical server (private IP 10.2.2.2). Such proxy service is associated with a WideIP proxy.abc.com (1.1.1.1) on GTM. They would use a new public IP address for the new server (2.2.2.2).
We created a new WideIP proxytest.abc.com for testing the new public IP address, with all settings (pool, server, virtual server, etc) identical to proxy.abc.com.
If we do the query from internal network to GTM using GTM's public IP address (nslookup proxytest.abc.com 3.3.3.3), it replies correctly (with 2.2.2.2 only). However if we do the query from Internet using the same command, GTM replies with "no such name" which I found using tcpdump on GTM.
If we do the query "nslookup proxy.abc.com 3.3.3.3" from internal network, GTM replies both 10.1.1.1 and 1.1.1.1. If we do the query "nslookup proxytest.abc.com 3.3.3.3" from internal network, GTM replies only 2.2.2.2.
This is the difference I can identify with both WideIP configurations.
I don't have much experience with GTM. Can someone shield some light on this?
Thanks in advance.