Vish - Thank you for responding. So, when using multiple interfaces, will setting the PUBLIC_INTERFACE to the separate interface w/o VLANing work? Is that what you are saying below? Are any additional configuration parameters then required such as "flat_network _bridge"?
Something still puzzling me: 1. From my routing table below, it appears both the public interface AND the flat interface are on br100 (which is bound to eth2). I didn't think a bridge could have more than one subnet attached to it at any one time. I was apparently wrong. 2. My br100 has an associated address of 11.0.4.12, but eth2 has the IP address of 192.168.12.105. br100 then, has the public_interface traffic (floating_range - 192.168.12.x) and the fixed_address traffic traversing eth2, correct? Is my understanding of what is going on correct? convirt@convirt-r01:~/devstack$ netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 192.168.12.1 0.0.0.0 UG 0 0 0 br100 10.0.4.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.0.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 11.0.4.0 0.0.0.0 255.255.255.0 U 0 0 0 br100 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 0 br100 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 convirt@convirt-r01:~/devstack$ brctl show bridge name bridge id STP enabled interfaces br100 8000.00163e098238 no eth2 vnet0 virbr0 8000.000000000000 yes Thanks for taking the time to explain things, ~kvs From: Vishvananda Ishaya <[email protected]> Date: Tuesday, August 14, 2012 8:01 PM To: Kurt Scholtens <[email protected]> Cc: <[email protected]> Subject: Re: [Openstack] Devstack multinode Installation network configuration help and bridging explanation On Aug 14, 2012, at 1:24 PM, Kurt Scholtens <[email protected]> wrote: > Any takers? > > I am looking for guidance on my current deployment. Let me start by saying, > it works. That being said, I want to ensure what I am doing makes sense > because I'm slightly confused by the networking. Specifically, the bridging > doesn't make sense at all. If you look at my bridging below, it appears both > my public network (192.168.12.x) and my host to host management network > (10.0.5.x) are getting bridged on br100. More precisely it appears my > FIXED_NETWORK (11.0.4.x) as well as my public network aka FLOATING_RANGE are > getting bridged to br100. I do access my openstack hosts on 192.168.12.x as > well as my openstack instances on this network. I just am not understanding > the networking for this set up, even though it works. If you want the floating ips on a different interface (say eth1) you can use: PUBLIC_INTERFACE=eth1 devstack defaults PUBLIC_INTERFACE to br100 because that is the only way to make it work if you have a single interface and you don't set up vlans. with multiple interfaces and vlans, generally you put public_interface and flat_interface on different devices. Vish
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