Site to Site DNS resolution
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I have a really odd issue with my DNS resolution and i can't really figure out where to even start debugging it!.
So the setup:
4 sites, A, B, C, DSite A (main site)
- VPN server for Site B, C and D (A-B, A-C, A-D).
- so Site A has 3 vpn servers (one for each site
FRR between site and all works fine with IP.
The issue i have is with DNS. So my dns is configured with domain overrides for each site (on dns resolver on each site). If i navigate to the router on from/to any site it doesn't find anything, wait 15 seconds or so and it resolves correctly. If i then don't use that address for a while it looses the dns and then i have to navigate to the address and wait 15 second again.
So i think the issue is its not storing dns domain overrides anywhere (hence looses them) and also isn't correctly forwarding the requests hence not getting a timely response.
I can work around this by adding host overrides for the main addresses i use but i would rather fix it so it resolves correctly.
So the question is.....Where should i begin debugging the issue?