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I've migrated a server from vmware to openvz, both are running on the same physical host (I plan to eliminate vmware). If I give the new openvz container a new IP anybody on the LAN and outside network can get to it with no problem, but as soon as I change its IP address to the original IP (that the vmware guest used to have), only the host server and its contained virtual machines can get to it.

I have made sure to change the IP on the old virtual machine.

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You might be running into an ARP caching issue - have you verified the ARP cache contents of the hosts which are unable to connect? –  the-wabbit Nov 3 '11 at 19:34
    
I only tried deleting the ARP record for that IP on the host server, but it complained that there was no record (even though it was listed when i issued 'arp'). ARP is one of those things I don't understand much about, do you think I might need to clear that cache on our sonicwall router? –  andyortlieb Nov 3 '11 at 19:47
    
Can the new container access the outside network? Have you tried traceroute to and from the container? –  Aleksandr Levchuk Nov 4 '11 at 13:11
    
It turned out to be the arp cache on our router. @syneticon-dj : if you post an answer I'll accept it, since your comment was invaluable. –  andyortlieb Nov 6 '11 at 2:15

2 Answers 2

up vote 1 down vote accepted

Adding the hint as an answer:

You might be running into an ARP caching issue - have you verified the ARP cache contents of the hosts which are unable to connect?

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My openvz host still had a static route to the VM I migrated from openvz to KVM.

A route del -host <ip_addr> fixed the issue for me.

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