Per-tenant routers with private networks

asked 2013-07-29 09:43:23 -0600

badkarma gravatar image

updated 2013-07-29 16:51:42 -0600

smaffulli gravatar image


I just installed an all in one solution on a CentOS 6.4 server with one network card as a POC.

Trying to setup something like this:

Is a configuration like this possible with one network card? If so, can it be done without GRE? (I have to recompile ovs for this I believe)

I also have a question about the external network. The server NIC is on So I should great an external network in openstack with the network and then connect my virt routers to it?

Thanks for any help, my linux networking skills are not much more than basic at the moment.

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answered 2013-07-29 14:17:44 -0600

darragh-oreilly gravatar image

Without IP namespace support from the OS, you will only be able to run one router per node, and overlapping IPs are not possible. See limitations and here for more details.

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Thanks for that info, I'm using Redhat RDO, which has an updated kernel, iputils and iproute to handle the namespace issue, not so much for GRE. Even with these updates it looks like I have to install another NIC and cable it...or try a dummy NIC which may be more of a pain that adding a NIC

badkarma gravatar imagebadkarma ( 2013-07-30 12:34:41 -0600 )edit

Ok good. No the use case does not require the OVS plugin in GRE mode. But you only have one node, so you don't need to concern yourself with that anyway - use 'local'. Yes, the easiest thing would be to add an extra nic for the external network.

darragh-oreilly gravatar imagedarragh-oreilly ( 2013-07-30 15:36:48 -0600 )edit

That's what I finally did, just installed another NIC and all is working well. Thanks for your help darragh

badkarma gravatar imagebadkarma ( 2013-07-30 17:49:47 -0600 )edit

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Asked: 2013-07-29 09:43:23 -0600

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Last updated: Jul 29 '13