Help with pxe guest VM install

[William Murray]

   Dear list,
       I have been trying to setup a PXE guess installation on Fedora 17 
with no success.
I build a bridge, and connect my VM to it but DHCP times out in the VM 
install.
I don't know how to debug this bridge. I guess I could connect a 'live' 
machine to it,
but what then?

I follow:

http://docs.fedoraproject.org/en-US/Fedora/13/html/Virtualization_Guide/sect-Virtualization-Network_Configuration-Bridged_networking_with_libvirt.html 

and
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/sect-Virtualization_Host_Configuration_and_Guest_Installation_Guide-Guest_Installation-Installing_guests_with_PXE.html 


These guides almost work. Two differences show up:
  brctl show
bridge name    bridge id        STP enabled    interfaces
br0        8000.14feb5b90f56    no        p5p1
virbr0        8000.525400da475b    yes        virbr0-nic

The virtual bridge has an interface. I assume I set this up in the dim 
and distant past, but I don't think it is relevant.

# service iptables save
Redirecting to /bin/systemctl save  iptables.service

Unknown operation 'save'.

This I think I work around using the iptables rules relating to a bridge.

One stupid question: does the external network see the MAC address of 
the host or the guest?
    Thanks for any other ideas...
           Bill

-- 
Bill Murray                     ----                       ATLAS
STFC RAL at: Bat 40 4-C28, CERN,1211 Meyrin, Geneve 23, Switzerland
   Tel:- CERN +41 22 7678432    or  RAL +44 (0)1235 446256