Been having a little bit of a headache recently with DNS over site to site VPN.
We have a SBS within a hosted environment and an RDS. The SBS is of course hosting DNS for the internal domain. The office has all Domain Workstations running Windows 7. All seems to run fine until DNS lookups fail internally, I changed the SBS to have only 127.0.0.1 as primary DNS (took out a public secondary) and changed the RDS to have only the internal IP for SBS (again took out a public DNS secondary) and this seems to have fixed the issue.
My question is why? My thoughts on DNS are:
Workstation - DNS Lookup - DNS Server replies with IP - Workstation can find machine via IP
So how would changing IP address (secondary) on the Servers affect what the workstations get as a reply from a DNS query?
Sorry hope this makes sense I tried my best not to waffle!