TMG ISP Redudancy and DNS
Posted on 2014-01-13
actually this is the continuation of my previous question
I have installed TMG with 3 NICs such as ISP1, ISP2 and Internal
I configured the ISP1 and ISP2 interfaces with IP addresses and default gateways and
configured internal NIC with IP address, but no Default Gateway.
I installed DNS service on TMG and configured the forwarders pointing to ISP DNS servers.
Finally Internal NIC DNS configuration as follows
Primary : 127.0.0.1
Alternative: Internal AD DNS servers
Configured persistent routes
Network Address Netmask Gateway Address Metric
10.0.0.0 255.0.0.0 10.1.2.1 1 ( Internal LAN)
126.96.36.199 255.255.255.255 192.168.5.1 2 ( ISP1 DNS Server)
188.8.131.52 255.255.255.255 192.168.4.2 3 ( ISP2 DNS Server)
0.0.0.0 0.0.0.0 192.168.4.2 Default
0.0.0.0 0.0.0.0 192.168.5.1 Default
Suddenly I started facing a problem that web proxy client receiving a pop up Authentication Required.
I tried nslookup on TMG server for my domain domain but cannot resolved.
I would highly appreciate any help.