Xen devel - Jan 2009 - Changing MAC address of Xen domU after live migration?

Hi,

For my experiment on live migration of Xen VMs, I want the MAC address of
the migrated VM (domU) to change soon after migration, but just before the
Gratuitous ARP reply is sent. Do you know where in the code/scripts I can
add this feature?

Thanks,
Vikram


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Hi,

For my experiment on live migration of Xen VMs, I want the MAC address of
the migrated VM (domU) to change soon after migration, but just before the
Gratuitous ARP reply is sent. Do you know where in the code/scripts I can
add this feature?

Thanks,
Vikram


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Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Hi,

you could specify e.g.:

  vif = [
        ''mac=00:16:3E:2A:F7:18,bridge=intern'',
        ''mac=00:16:3E:77:AD:AA,bridge=extern'',
        ''mac=00:16:3E:61:A5:4F,bridge=dmz'',
        ''mac=00:16:3E:64:45:2A,bridge=wlan''
  ]

In your DomU''s configuration files.

BR,
Carsten.

Von: Vikram Subramanya [mailto:vikram.s3@cs.ucsd.edu] 
Gesendet: Samstag, 24. Januar 2009 23:44
An: xen-devel@lists.xensource.com
Betreff: [Xen-devel] Changing MAC address of Xen domU after live 
migration?

Hi,

For my experiment on live migration of Xen VMs, I want the MAC address 
of the migrated VM (domU) to change soon after migration, but just 
before the Gratuitous ARP reply is sent. Do you know where in the 
code/scripts I can add this feature?

Thanks,
Vikram


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

On Sat, Jan 24, 2009 at 02:43:49PM -0800, Vikram Subramanya
wrote:
> For my experiment on live migration of Xen VMs, I want the MAC address of
> the migrated VM (domU) to change soon after migration, but just before the
> Gratuitous ARP reply is sent.
Care to explain why? Upstream kernels will not send an ARP in this case
anyway.
>                               Do you know where in the code/scripts I can
> add this feature?
You can remove the network interface before suspend and readd it after
the migration.

Bastian

-- 
Mind your own business, Spock.  I''m sick of your halfbreed
interference.

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>
> you could specify e.g.:
>
>  vif = [
>        ''mac=00:16:3E:2A:F7:18,bridge=intern'',
>        ''mac=00:16:3E:77:AD:AA,bridge=extern'',
>        ''mac=00:16:3E:61:A5:4F,bridge=dmz'',
>        ''mac=00:16:3E:64:45:2A,bridge=wlan''
>  ]
>
Thanks for your reply, but unfortunately Xen treats the various options in
vif as AND instead of OR. Which means that it expects bridges intern AND
extern AND dmz AND wlan on each physical host.

In my first host which had bridge ''intern,'' I got this error
when I tried
booting Xen DomU.

"Error: Device 2 (vif) could not be connected. Could not find bridge device
extern"

I want to Xen DomU to choose the bridge that is available (and not expect
all the bridges to be present) on the Dom0 it is currently on, even after
migration.

I am in the following situation now:

   - When DomU is on 10.2.0.2, it should have mac=00:00:10:02:00:02.
   - When it migrates to 10.3.0.1, it should have mac=00:00:10:03:00:01.


How can I get around this problem? Thanks a lot for your timely help!

Vikram


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