Xen users - Sep 2006 - Providing dhcp for a "private" bridge?

Hello all,



I''d like to create a "private" bridge -- that is, one that
doesn''t
include an external interface -- and provide DHCP services to Xen VMs attached
to that bridge.  Mostly, this works great; creating the bridge and the Xen
VMs worked without a problem.



Getting dhcp working has been a little more
difficult.



In dom0, "dummy0" is 192.168.100.1.  I''d like dhcpd to listen
on this interface, but dhcpd says:



  No subnet declaration for dummy0 (0.0.0.0).



For whatever reason, dhcpd appears to be unable to deal with dummy interfaces.



What are other folks doing in this situation?  I could try assigning an
IP directly to the bridge device, rather than using the dummy interface, but
that strikes me as less than optimal (because it makes the bridge configuration
unique).



Thanks for your thoughts,



  -- Lars



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On 19 Sep 2006 13:06:24 -0000,
larsks.21230602@bloglines.com
> [...]
> What are other folks doing in this situation?  I could try assigning an
> IP directly to the bridge device, rather than using the dummy interface,
but
> that strikes me as less than optimal (because it makes the bridge
configuration
> unique).
Yeah, I am doing exactly this and it works quite nice (I don''t
understand your "unique remark" right now).
I only do this on my mobile development system, so if I had enough RAM
and disk space, I''d just run an extra dhcp vm on the bridge.

Henning

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Let me guess, you''re using Fedora/RedHat.
Their dhcpd is compiled without support for dummy interfaces. I started
out by rebuilding the RPM with dummy interface support, but stopped
after I got tired of chasing fedora''s dhcpd updates.

I then turned to henning''s idea of a dhcp vm, using a minimal image
that
takes only 16M RAM and about twice the disk space.


+Katriel

larsks.21230602@bloglines.com wrote:
> Hello all,
> 
> 
> 
> I''d like to create a "private" bridge -- that is, one
that doesn''t
> include an external interface -- and provide DHCP services to Xen VMs
attached
> to that bridge.  Mostly, this works great; creating the bridge and the Xen
> VMs worked without a problem.
> 
> 
> 
> Getting dhcp working has been a little more
> difficult.
> 
> 
> 
> In dom0, "dummy0" is 192.168.100.1.  I''d like dhcpd to
listen
> on this interface, but dhcpd says:
> 
> 
> 
>   No subnet declaration for dummy0 (0.0.0.0).
> 
> 
> 
> For whatever reason, dhcpd appears to be unable to deal with dummy
interfaces.
> 
> 
> 
> What are other folks doing in this situation?  I could try assigning an
> IP directly to the bridge device, rather than using the dummy interface,
but
> that strikes me as less than optimal (because it makes the bridge
configuration
> unique).
> 
> 
> 
> Thanks for your thoughts,
> 
> 
> 
>   -- Lars
> 
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
- --
Katriel Traum, PenguinIT
RHCE, CLP
Mobile: 054-6789953
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