delay starting dhcp server

Sorry if the belong in the networking & wireless sub-forum.
i found this, it seems close to what i want to do
http://askubuntu.com/questions/3651/...interface-to-i
this is currently in my /etc/network/interfaces file

Code:

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# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

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during the boot process isc-dhcp-server tries to startup several times and fails
this is in my /etc/rc.local script cause i don't know the proper way to do this

Code:

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echo 1 > /proc/sys/net/ipv4/ip_forward
while [ 0`pidof NetworkManager` -eq 0 ]; do # wait for net manager to start so ifconfig will work right
    sleep 1
done
while [ "`ifconfig eth0 | grep 'inet addr:'`" = "" ]; do # wait for external IP address
    sleep 2
done
while [ "`ifconfig eth0:1 | grep 'inet addr:'`" = "" ]; do # create new net interface
    sleep 2
    ifconfig eth0:1 10.0.0.1 netmask 255.255.0.0
done
# make new interface do what is needs to do
#iptables -t nat -A PREROUTING -o eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.0.0.75:80
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -P FORWARD ACCEPT
service isc-dhcp-server start

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how should i do this, should i just add this to my /etc/network/interfaces file

Code:

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iface eth0:0 inet static
    bridge_ports eth0 eth0:1
    address 10.0.0.1
    broadcast 10.0.0.255
    netmask 255.255.0.0
    post-up /etc/init.d/isc-dhcp-server start
    pre-down /etc/init.d/isc-dhcp-server stop

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if that will work what do i do to my /etc/rc.local script