main/server/dhcp/files/12-dhcpd

#!/bin/bash
export LC_ALL=C

[ -f /etc/sysconfig/dhcpd ] && . /etc/sysconfig/dhcpd

# restart dhcpd whenever $1 interface is brought up by NM (rhbz #565921)
if [ "$2" = "up" ]; then
	# exit if the service is not configured to be started in the current runlevel
	/sbin/chkconfig dhcpd || exit 0

	# exit if dhcpd is not defined to listen on $1
	# i.e. if there are interfaces defined in DHCPDARGS and $1 is not among them
	if [ -n "${DHCPDARGS}" ] &&
	   [[ "${DHCPDARGS}" == *eth* ]] &&
	   [[ "${DHCPDARGS}" != *$1* ]]; then
		exit 0
	fi

	# restart service
	/sbin/service dhcpd restart || :
fi