install windows7 problem

[horebdata]

I want to install windows7 to an iscsi target using pxe. I have configured dhcp and tftp correctly and I use undionly.kpxe as the boot file.

When booting from undionly.kpxe, I got an error:
[Link:up, TX:0 TXE:1 RX:0 RXE:0]
[TXE: 1 X "Network Unreachable (http://ipxe.org/28086011)"]

But it can load my boot file install.ipxe in tftp server.
my install.ipxe file:
#!ipxe
dhcp net0
set keep-san 1
sanboot iscsi:192.168.0.1::::iqn.install

Then it can boot from CD normally.
If I use windows7 iso in CD I can not see the iscsi disk during the installation. But if I use centos iso it works as intended!

Anyone can help? Thanks!