14.04 server PXE installation fails at "Configure the network" page

Tried unattended PXE install, it fails at this page

Network autoconfiguration failed
Your network is probably not using the DHCP protocol. Alternatively,
the DHCP server may be slow or some network hardware is not working
properly.

My DHCP server works fine with 12.04 and all other Linux distributions, such as RHEL and SLES. More importantly, pxelinux.0 is fetched over and the kernel and initrd are downloaded and started. So I assume this should be a client problem instead of server's. In particular, the 14.04 installer problem.

Jump to a shell in the installer, found ifconfig is not available. Tried dhclient, it returns no error (return code is 0 too) but still cannot ping the PXE or DHCP servers. The error for failed ping is "Network is unreachable". tcpdump shows there is not any DHCP request on the DHCP server after the initial one in PXE.

lspci shows all the NICs.

01:00.1 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller
...

Any idea what could have gone wrong?

Other info:

ip link shows the interface is p1p1 but /etc/network/interface shows only eth0 is configured.

~ # ip link
1: lo:  mtu 65536 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: p1p1:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:12 brd ff:ff:ff:ff:ff:ff

3: p2p1:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:14 brd ff:ff:ff:ff:ff:ff
4: p3p1:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:10 brd ff:ff:ff:ff:ff:ff
5: eth3:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:16 brd ff:ff:ff:ff:ff:ff
6: rename6:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:17 brd ff:ff:ff:ff:ff:ff
7: p2p2:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:11 brd ff:ff:ff:ff:ff:ff

8: p4p1:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:13 brd ff:ff:ff:ff:ff:ff
9: p5p1:  mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:22:99:b2:00:15 brd ff:ff:ff:ff:ff:ff

/etc/network # cat interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).


# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 172.25.0.101
        netmask 255.255.255.0

        network 172.25.0.0
        broadcast 172.25.0.255
        gateway 172.25.0.1
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 172.25.0.1

Append biosdevname=0 to the kernel in the PXE default file, that solves this network problem. The reason can be found in this document:

Reference: Nicnaming – Solving it with Biosdevname