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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, 2011 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, 2011 at 19:47
  • Can the new container access the outside network? Have you tried traceroute to and from the container?
    – Aleksandr Levchuk
    Nov 4, 2011 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, 2011 at 2:15

2 Answers 2

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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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