Re: What's not to understand???
Here's what you need to do.
You need to set up a second hardware profile on the box. This is the only way to have two sets of network settings on the same physical card - SHORT OF actually binding two different IP addresses to the same card. Trust me, you don't want to do that.
This is a terrible idea! Even if it works (no intervening switch to drop packets, unlikely on a corporate net) it's a horrible violation of good network administration.
As for not using a second IP address on the same interface, there are very good reasons to do that (see below) but they are not related to CRC's problem.
-drl