I am trying to figure out a DNS issue.
We have a main office and several small offices connect back to it via site-to-site VPNs. DNS is handled by our SBS server in the main office, which is where all the other domain resources are .
Back at the SOHO, the local router hands out the ip settings via DHCP. The primary DNS is the one at the main office, then the local ISP DNS is secondary and tertiary, in case there's a problem with the VPN.
Well often, their is a "no host found" when trying to ping via hostname or fqdn, but via IP works fine. ipconfig /all shows the office's DNS, so I cannot figure out where to go from there.
The issue is sporadic. One user will have connectivity. Others don't. Then only one user won't be connected while 3-4 are... I don't get it.
Finally, these are SonicWall routers in the field connected to a Cisco ASA 5500 it the main office.
Any help would be appreciated.
Thank you very much for your time.