Route packets out to the internet on DHCP interface.

[limleeheng]

Hi all,

I will like to connect my network to cable modem which will automatically lease IP from ISP. The modem is then connected to my Cisco Router.

What could I do to make sure that unknown destination(network) will go to the Internet? Explain: 202.156.1.38

Someone suggested NAT on the router to the cable modem. However, what could be my global address?

Please advise.

Diagram

=======

Cable modem---->Cisco Router A--->Cisco Router B---> Cisco Router C->Cisco Router D- >Cisco Router---> Cisco Router--->Cisco Router ->Cisco Router

Total is 8 routers.

[Richard Burts]

If your network is large enough to need 8 routers I wonder if the capacity of a cable modem will really be sufficient for internet connectivity.

But you did not ask if it would work well, you asked if it would work. The best way to make it work is to run a dynamic routing protocol among your 8 routers and to have router A announce a default route to the others. The mechanics of how to do that depend on which routing protocol you choose, but for example with OSPF you configure default-information originate. This will provide that the other routers will forward packets for unknown destinations to router A.

On router A you would configure a static default route pointing to the interface with the cable modem. You would also configure on the interface with the cable modem address negotiated so that the router will negotiate with the cable modem and accept the address that the cable modem assigns.

HTH

Rick