ubuntu 12.04 pxe boot fail with message IP-Config: no response after * secs - give up

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http://www.linuxquestions.org – I followed the DisklessUbuntuHowto and set up my pxe boot service. When configure the dhcp server in /etc/dhcp/dhcpd.conf, I tried to use static IP address as follows, in which "00: 22: 15: F8: D9: 1A" is the mac address of the first network card in sms04 (it has two). Quote: allow booting; allow bootp; subnet netmask { range; option broadcast-address; option routers; option domain-name-servers; filename "/pxelinux.0"; } host sms04 { hardware ether (HowTos)