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Duplicate Ping Packets - Promiscuous Mode?

asked 2013-11-27 16:25:26 -0500

antonnoble gravatar image

updated 2013-11-27 16:55:03 -0500

I am seeing duplicate ping packets when I ping an instance. This goes both ways...from the instance to the outside world and from the outside world to the instance.

root@openstackcloud1:~# ping 172.16.44.161
PING 172.16.44.161 (172.16.44.161) 56(84) bytes of data.
64 bytes from 172.16.44.161: icmp_req=1 ttl=64 time=1.37 ms
64 bytes from 172.16.44.161: icmp_req=1 ttl=64 time=1.44 ms (DUP!)
64 bytes from 172.16.44.161: icmp_req=2 ttl=64 time=0.796 ms
64 bytes from 172.16.44.161: icmp_req=2 ttl=64 time=0.822 ms (DUP!)

I noticed this bug: https://bugs.launchpad.net/nova/+bug/956474

And performed the ip link set brXXX promise off on both my controller and the instance...

I am running vSphere as my hypervisor and promiscuous mode is required on the vSwitch according to VMware documentation... If I turn it off traffic to my instance stops.

Help.

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We are facing the same problem. The vSwitch runs in „Promiscous Mode“. I was able to narrow down the problem a bit. It seems to me that every incoming package that is transmitted to an interface that runs in „Promiscous Mode“ gets duplicated. Have you found a solution to the problem?

Herr-Herner ( 2015-07-28 01:16:22 -0500 )edit

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answered 2015-07-30 08:03:04 -0500

Herr-Herner gravatar image

We came to the conclusion that it is definitely no OpenStack issue. It's a vSphere problem in combination with „Promiscous Mode“. The vSwitch sends all those ethernet frames twice to a network interface that is in „Promiscous Mode“ which have a destination address that is unknown to the vSwitch. We try different configuration settings in order to solve the problem. Unfortunately, we have not found a working solution so far.

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Asked: 2013-11-27 16:25:26 -0500

Seen: 467 times

Last updated: Jul 30