[Openstack] [neutron] how to use multiple external networks?
Mike Spreitzer
mspreitz at us.ibm.com
Thu Apr 9 01:35:34 UTC 2015
Oops, my original email did not contain all of the constraints. Each
compute instance gets only one network interface, only one IP address.
Does Juno Neutron have a way to solve this problem?
Thanks,
Mike
From: James Denton <james.denton at rackspace.com>
To: Mike Spreitzer/Watson/IBM at IBMUS, openstack
<openstack at lists.openstack.org>
Date: 04/08/2015 07:04 PM
Subject: Re: [Openstack] [neutron] how to use multiple external
networks?
Hi Mike,
With those requirements, I think dual-homing the instances may be the best
approach.
In my mind, you would have 5 networks:
A - External Network 1
B - External Network 2
C - Tenant Network 1
D - Tenant Network 2
E - Shared Tenant Network (No gateway)
Because routers can only connect to one external network at a time, and a
tenant network can only be connected to one router at a time, you would
need two routers:
Router 1
Router 2
You would connect them as follows:
External Network 1 <-> Router 1 <-> Tenant Network 1
External Network 2 <-> Router 2 <-> Tenant Network 2
The VMs would then connect as follows:
Tenant Network 1 <-> VM1 <-> Shared Network
Tenant Network 2 <-> VM2 <-> Shared Network
With no gateway set on the shared network, you won't have to worry about
multiple default routes, nor do you need to worry about terminating that
network off a router. It's simply isolated.
Hope that helps,
James
From: Mike Spreitzer <mspreitz at us.ibm.com>
Sent: Wednesday, April 8, 2015 12:28 PM
To: openstack
Subject: [Openstack] [neutron] how to use multiple external networks?
Supposing there are two external provider networks, and a tenant wants (a)
some of his Compute Instances to have floating IP addresses on one of
those external networks, (b) some other of his Compute Instances to have
floating IP addresses on the other external network, and (c) all of his
Compute Instances to be able to talk to each other using only tenant
private networking, what arrangement of tenant networks and routers would
accomplish this? In Juno, if it matters.
Thanks,
Mike
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