Cannot get through PXE boot: dracut duplicate address problem

[Nat Sincheler]

(I realize this is not strictly speaking an FAI issue, but I am hoping 
that one you FAI users has a solution.)

We are trying to install the old Debian wheezy on a Dell PE 620 using 
FAI. The first step is the PXE boot where the wheezy bootstrap image is 
downloaded from our tftp server. The boot image downloads and gets quite 
far along. However, about 3 or 4 minutes into the PXE boot we see this 
error message and then the boot stops:

dracut Warning: Duplicate address detected for X.X.X.X while doing dhcp. 
retrying
dracut Warning: could not boot.


Our PXE config file is this:

default vmlinuz-3.2.0-4-amd64
label vmlinuz-3.2.0-4-amd64
default vmlinuz-3.2.0-4-amd64
serial 0 9600
append aufs ip=dhcp initrd=initrd.img-3.2.0-4-amd64 
root=nfs:10.0.225.226:/srv/fai/wheezy-amd64,nfsvers=3 FAI_ACTION=install 
FAI_FLAGS=verbose,createvt FAI_SERIAL=9600 HOSTNAME=kerberos-standby 
FAI_CONFIG_SRC=nfs://171.65.225.226/srv/fai/config 
rdblacklist=nouveau,qla2xx,pcspkr console=tty0 console=ttyS1,9600n8 
FAI_PORT=ttyS1