On 8/13/12 12:35 PM, James Hogarth wrote: > Hmm this is especially weird given the 5.8 systems are working - > otherwise I'd have moved the troubleshooting up to vmware or the > switch next... Migrating one of the vms to the same physical host made them start talking to each other, so it's definitely a vmware issue, though why it's interacting badly with centos 6 is a good question. It could be a bug in vmware tools/the ethernet driver. At least it's narrowed down now...