Question : dhcpcd and router function

Hello,

I'm making a linux router box.
My linux box has 2 LAN port(eth0 and eth1).
I assign a static IP at eth0 and a dynamic IP at eth1 using DHCP.
When I using "pump" as dhcp client program, my box works well as router. ;-)
However, if I use "dhcpcd", my box does not working as router. :-0
(pump and dhcpcd get a dynamic IP from the dhcp server)

In my case, pump did not connect some dhcp servers.
So, I want use dhcpcd.

Thanks,

h2y