Unable to kickstart kvm guest over pxe boot

Issue

• Unable to kickstart kvm guest over pxe boot. However able to kickstart a regular host over pxe boot so the pxe boot configuration works.
• The setup is as follows:
  • Have a working dhcp server to which add the clients mac address and configuration settings.
  • Have a working tftpboot service running on the same server where dhcp sits and its also working.
• The problem however comes up when try to launch kvm guest to be installed over pxe boot with the following command:

/usr/sbin/virt-install --hvm --connect qemu:///system --network=bridge:br1 --pxe -n kvmtest -r 2048 -m 00:16:3e:22:a5:7a --vcpus=1 -s 10 --os-type linux --os-variant rhel6 -f /kvm/umlaut/kvmtest.img

• Further more when try to boot the kvm over cdrom and then issue a kickstart then it works fine.

boot: linux ks=http://blackwood1/path/to/ks.cfg ksdevice=eth0

• Also here is what nics look like.

eth0 = public  (used for host public interface only)  
eth1  = bridged into br1;  
br1    = bridge  (used for kvm guest public interface ex: eth0)