Hello,
I use TMG 2010 on Windows 2008 R2 Standard.
On TMG I have three NIC:
- NIC1 - intranet 192.168.1.19
- NIC2 - ISP1 (178.xxx.xxx.66)
- NIC3 - ISP2 (91.xxx.xxx.2, 91.xxx.xxx.3) - 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 (91.xxx.xxx.3) from outside. I can ping 178.xxx.xxx.66, i can ping 91.xxx.xxx.2 without any problem, but I can not ping the 91.xxx.xxx.3...
Okay. I start some experiments. I connect another computer with 91.xxx.xxx.5 in the ISP2 provider switch and can ping from 91.xxx.xxx.5 to 91.xxx.xxx.3 and vice versa without any troubles.
Next step. I install Network Monitor on TMG and can see the interesting thing: the reply packet from 91.xxx.xxx.3 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?..
