esx with private network

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http://www.linuxquestions.org – Here is an outline of the configuration: Host A 2 nics, one goes to standard network, second to private esx network Host B 1 nic, goes to private esx network The two hosts can reach each other just fine. And host A can reach the outside fine as well. I'm going to be running stress tests between host A and host B, so I need to ensure the standard network does not see any of the traffic. How does linux figure out what nic to go through when I type something like ping hostb? What can I do to ensure packets for hostb always go out the right nic and never try the wrong one? (HowTos)