On Fri, 2009-11-27 at 12:12 -0500, Kelvin Edmison wrote: > On 26/11/09 10:16 PM, "Tait Clarridge" <tait at clarridge.ca> wrote: > > > On Fri, 2009-11-27 at 14:02 +1300, Steven Ellis wrote: <snip> > > > > So if I have this right, at the basic level you wish to have: > > > > - One interface for Host machine > > - Multiple interfaces for guest traffic > > > > If your environment supports VLANs (802.1Q), might I suggest a trunk > > port on eth1 split up into different bridges to have the KVM guests go > > through to get on different VLANs/address spaces. > > > > This is what I currently do for Xen and it works great. What kind of > > network setup to you have? > > Could you please provide some pointers on how you accomplished this? I've > been attempting to set up a similar configuration without success. > > Thanks, > Kelvin > Sure. The way we would do it for a 2 NIC box would be: eth0 - VLAN trunk eth1 - Storage Network VLAN After you have been given a trunk port with a native vlan (for eth0, allowing you to set an IP for this connection) you can run or script the following: - Load the VLAN module modprobe 8021q - Use vconfig to add VLAN interfaces - This is going to assume that eth0 is your trunk port - eg. vconfig add eth0 <vlan number> - So for VLAN 22 it would be: vconfig add eth0 22 - Add the bridge for xen to use (requires bridge-utils package) - eg. brctl addbr xenbr<vlan#> - VLAN 22 would be: brctl addbr xenbr22 - Add the VLAN interface to the bridge - eg. brctl addif xenbr<vlan#> eth0.<vlan#> - VLAN 22 would be: brctl addif xenbr22 eth0.22 - Bring both the bridge and the VLAN interface up - eg. ifconfig eth0.<vlan#> up - eg. ifconfig xenbr<vlan#> up - VLAN 22 would be: ifconfig eth0.22 up ifconfig xenbr22 up If you wanted to script it to run at boot time you can create a simple for loop with a list of VLANs to use. In this case I want to use VLANS: - 2 - 4 - 6 - 8 - 200 - 120 The script would start as follows: #!/bin/bash VLANS="2 4 6 8 200 120" modprobe 8021q for i in $VLANS do # above commands go here # starting from vconfig add eth0 22 # just change 22 from the examples to $i done If you have any trouble, let me know. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20091127/5582f897/attachment-0004.sig>