Looks the moderm dhcp server can issue an public Internet IP, that's why
I want to do relay...

Cameron Kerr wrote:
> Nick <nbdy9@hotmail.com.nospam> wrote:
>
>>I have a cable modem/router which have a built-in dhcp server. I have a
>>route PC with multiple network cards connecting to the cable modem and
>>other PCs connect to the route PC.
>>
>>How to let other PCs get the dhcp address from the cable modem?
>
>
> Firstly, I would suggest disabling the DHCP on the modem, and moving it
> to your Linux router. More control that way, and better flexibility.
>
> If you really wanted DHCP to work across broadcast domains (across
> routers), then you can install dhcp-relay on the Linux router. Under
> Debian, you can use the dhcp3-relay package. Otherwise, it may come in
> your dhcp server package.
>