I assume the host site has dns running on something other than a router and that it is configured to reply to dns queries for zones it is primary for, but forward dns queries for zones it is not. That would be a standard MS domain controller/dns installation. If that is the case, then I would configure the remote routers as dns caching proxies as the first article in the link above explains.
For that you can use the DNS-views that can be configred in IOS. Lets assume you wnat to send queries for "*.company.local" to your internal server 10.11.12.13, but everything else to the ISP-DNS-server. That can be done the following way:
Prepare the Regex for the domains that need a special handling:
ip dns name-list 1 permit \.company\.local
Prepare all the views, one for each different DNS-need:
ip dns view COMP
dns forwarder 10.11.12.13
dns forwarding source-interface Vlan254
ip dns view default
domain timeout 2
dns forwarder 188.8.131.52
And now tell the router which view should be used for which queries. The name-group 1 references the name-list configured at the top:
ip dns view-list DNS
view COMP 10
restrict name-group 1
view default 1000
ip dns server view-group DNS
The internal server 10.11.12.13 should be the one that can resolve the name for the AV-server. If the IP is later changed, then you don't have to reconfigure all your routers that have this DNS-settings.
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