I need to use an internal Windows DNS server as my primary and any external DNS server as my secondary when delivering DHCP addresses to network hosts - basically the way Windows DNS provides scope options. The reason is that I need hosts to obtain local DNS information to tie into Active Directory whenver the server is on, but to access an external DNS server when the Windows server is down. I've tried several settings, the most relevant of which seems to be the DNS Server setting in Network Connections. Nothing works - all I get is the address of the MI424-WR when hosts do an IPCONFIG /release then IPCONFIG /renew. I thought the DNS Server setting in the router might be transparently used when hosts query it, but it's not. Proof - I can't ping internal hosts using their FQDNs. I can ping them using their NETBIOS names, so WINS is working. I'm using firmware version 220.127.116.11.18.104.22.168.6.
I'd appreciate any ideas here. Otherwise, I may have to add another device just for DNS, which is a waste. Thanks.