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weird host/vlan behavior

So I have a machine booted from PlateSpin's .iso disk (let's call it machine X). I set the IP information for machine X, which takes just fine. Here's where it gets weird...machine X can ping other hosts on the same subnet as well as the Internet, but nothing else. Other hosts on the same subnet can ping machine X as well as Internet, other subnets. No machine outside of machine X's subnet can ping machine X.

Again, I have other machines I've Platespinned off on the same subnet and they work just fine. Two machines in a row now, however, are giving me this issue. We did just move systems from one data center to another, but previously spun machines are working normally. All on the same subnet. I cannot reach the PortabilitySuite server from machine X because PortabilitySuite machine is on a different vlan.  Thoughts anyone?
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rlh33963
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rlh33963
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rlh33963Author Commented:
the solution was that I was given the wrong gateway IP in my documentation. I had been pointing to a BigIP device which routed straight to the outside. A change of gateway fixed the issue.
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