TMG with multiple IP addresses yet another problem


I use TMG 2010 on Windows 2008 R2 Standard.

On TMG I have three NIC:

  • NIC1 - intranet
  • NIC2 - ISP1 (
  • NIC3 - ISP2 (, - yes, multiple IP on the same subnet

TMG running in ISP redundancy mode (load balancing).

A problem: I can't ping the secondary NIC3 IP ( from outside. I can ping, i can ping without any problem, but I can not ping the

Okay. I start some experiments. I connect another computer with in the ISP2 provider switch and can ping from to and vice versa without any troubles.

Next step. I install Network Monitor on TMG and can see the interesting thing: the reply packet from is sending throw the NIC2 interface.

I check the Weak Host Send on all interfaces - it is turned off. I decrease NIC2 metric - the result is the same...

Can anybody give me some ideas how to fix this?..

  • Edited by keyser1971 Tuesday, September 08, 2015 8:25 PM
September 8th, 2015 8:20pm