unable to ping only one instance out of many

asked 2013-07-24 08:02:17 -0600

nishtha
61 ●4 ●6 ●9

updated 2013-11-18 06:43:26 -0600

I am unable to ping only a single instance although the status of all the instances is "running". I have 3 compute nodes installed and 1 controller node. My first instance's host is my 1st compute node. However, the other instance on the same compute node is not pinging. Why is this happening so?

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Could you clarify whether your setup uses neutron or nova-network? Also you may not have a route to ping a VM depending on where you are trying to ping from, so please clarify from where you are pinging.

annegentle ( 2013-12-02 16:30:44 -0600 )edit

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answered 2014-08-30 04:35:06 -0600

Germy Lure
31 ●2 ●5 ●6

Try to ping and then execute arp command. If arp show that your VM has not learned peer's MAC, I think you need check switch and ports. If it is OK, you should check routes.

Anyway, I suggest use tcpdump to dump arp or icmp packets. Good luck!