xcat-core/xCAT-nbroot/overlay/usr/share/udhcpc/default.script

#!/bin/sh
case $1 in
deconfig)
	/sbin/ifconfig $interface up
	/sbin/ifconfig $interface 0.0.0.0
	;;
bound|renew)
    echo $siaddr >> /tmp/dhcpserver
	/sbin/ifconfig $interface $ip netmask $subnet
        if [ -n "$router" ] ; then
             while route del default gw 0.0.0.0 dev $interface > /dev/null 2>&1; do
                :
               done

              for i in $router ; do
               route add default gw $i dev $interface
              done
        fi
        echo -n > /etc/resolv.conf
        [ -n "$domain" ] && echo search $domain >> /etc/resolv.conf
        for i in $dns ; do
          echo nameserver $i >> /etc/resolv.conf
        done
	;;
esac