[CentOS-virt] Question - Xen host, DHCPD and guest VMs

Fri Nov 6 15:26:17 UTC 2009
Scot P. Floess <sfloess at nc.rr.com>

I have a question about a Xen host that runs dhcpd and installing 
guest/running guest VMs on that host (that use DHCP)...

On other hosts or hosts running VMs, they are absolutely able to get DHCP 
addresses no trouble...  However, the fun begins when the machine I run 
dhcpd on is also hosting VMs.  I can see in /var/log/messages the request 
and ack from dhcpd but the guest VMs never hear it.  If I should bounce dhcpd prior to a guest install or start a guest VM 
- everything works just fine.

I'm guessing, perhaps, there is some iptables rule I need to set up? Based 
on the init scripts, dhcpd definitely starts before xend and xendomains 
and ultimately the xen bridge...

Anybody know what I need to do :)  I've been bouncing dhcpd in 
/etc/rc.local and starting any VMs there.  Although annoying, I'd rather 
do it "right" so I can auto start my Xen guests...

Thanks ahead of time!

Scot P. Floess
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Louisburg, NC  27549

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