Re: [Xen-users] 1 host, 1 nick, 1 regular bridge, 1 local bridge, 5 vm

[John Rounds <vannion@xxxxxxxxx>]

I think this might be the answer I needed Todd,   Going to give it a try soon.

On Tue, Mar 22, 2011 at 8:36 AM, Todd Deshane <todd.deshane@xxxxxxx> wrote:

On Mon, Mar 21, 2011 at 5:35 PM, Simon Hobson <linux@xxxxxxxxxxxxxxxx> wrote:
> John Rounds wrote:
>>
>> So Working on CEntOS 5  I am trying to sett up Xen with 2 bridges, one
>> that connects dom0 and most of the domU to the physical card and the out to
>> the network.  Got that figured out no problem, now i want to have a second
>> bridge that runs a local network for all the doms that doesn't connect to
>> the network.
>>
>> With code I have found used in multiple places I can easily get 2 bridges,
>> and have all the Domu connected to it but i can't get Dom 0 to have an
>> interface.
>>
>> Script to set up bridges called fine from xend-config.sxp
>>
>> ]# cat multiple-bridge
>> #!/bin/sh
>> dir=$(dirname "$0")
>> "$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=xenbr0
>> "$dir/network-bridge" "$@" vifnum=2 netdev=dummy bridge=xenbrloc1
>

> I'd suggest you setup the local bridge manually - not in Xen.
>

Good suggestion. We have documentation and notes on this, since this
is the way Xen 4.1+ will work.

See:
http://wiki.xensource.com/xenwiki/HostConfiguration/Networking
http://wiki.xensource.com/xenwiki/MigrationGuideToXen4.1%2B

Thanks,
Todd

> Is this Debian ? If so then you can put something like this in
> /etc/network/interfaces - check the syntax, I'm typing this from memory :
>
> auto xenbrloc1
> xenbrloc1 inet static
>  ip address a.b.c.d
>  netmask w.x.y.z
>  pre-up brctl addbr xenbrloc1
>  post-down brctl delbr xenbrloc1
>
> I think this should work for you. What happens is that when the I/F is
> brought up, the bridge is created first (pre-up), and then the IP addr is
> added to it. The bridge is automatically deleted if the I/F is taken down.
>
> For other distros you'll need to adapt as required.
>
> --
> Simon Hobson
>
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
>
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>



--
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/products/cloudxen.html

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