2 VMs on same host - one drops pings, other doesnt?

[sssstew]

Hi All

Got a strange one, ive got two VMs on the same host, if i run a constant ping from my workstation to these systems one shows a good solid 1ms, the other VM shows between 2 and 4ms and drops packets about once a minute.  Why would this be?

They are on the same network, same number of hops via tracert.  The only difference i can see is that one VM shows as running about  12.5 KBps on the network performance tab (the one that drops pings), the other shows only about 4 KBps on average.

Any clues?

[idle-jam]

what about vm to vm? if it's still the same chances is that it could be due to the OS related issue.

[sssstew]

hmm pinging each other internally seems to be ok with a short test i did this morning.....

[vm_arch]

What is the physical NIC config for the vSwitch these VMs are on?

I have seen this sort of intermittent issue previously where the vSwitch has 2 or more physical NICs assigned but where one of those physical NICs either has some contention (i.e. with svc console or other) or where one of the NICs is not connected/configured (i.e. switch port vLAN issue etc)

. VMware is smart enough 'usually' to route everything through the working NIC, but sometimes a packet or two might disappear into the black hole that is the other nic port.

[sssstew]

Two physical NICs in Active/Active.  With what looks like vmotion and service console also on, which isnt best, from my experience its best to seperate out the Vmotion and Service Console onto seperate NIC ports.....