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giving priority to one NIC

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giving priority to one NIC - 24.Jul.2007 3:56:00 PM

BrianRoden

Posts: 11
Joined: 19.Jul.2007
Status: offline

We have two NICs in our hub transport server. One connects to our internal network, which has a firewalled T-1 for access to the internet. The second NIC connects to a switch that hooks to our backup business DSL line. When we installed Exchange 2007, we used the DSL line for testing initial mail flow.

The problem we're running into is that mail to people on Comcast.com is being rejected. They're saying that the IP address of our mail server is dynamic, but it's now. We have a small group of fixed IPs on both the T-1 and DSL lines, and one is set as mailgateway.leisurearts.com for the T-1 and the other is mailgateway2.leisurearts.com on the DSL.

How can I force my hub transport to prefer the NIC that is on the internal network with the T-1 connection, but still have the secondary NIC on the DSL line working in case of an interruption in T-1 service?

I've followed Comcast's online reporting to request that they stop treating us as spammers because they think our IP address is dynamic. But I'd rather send out through the T-1 address anyway, since the transport will be faster.