Cisco Router as a Gateway

[ITbeast]

I have a Cisco 851 router that I would like to use as my gateway. I can get to the point where it uses DHCP to obtain an address from the modem and can ping externally from the router. But I can't seem to get the routing set up correctly because I can't ping externally from my laptop.

Basically I will have a public address on the fa4 interface. Then I want an internal network of 10.1.1.0 /24 on interfaces fa0 - fa3

Do I have to set up a routing protocol such as RIP or EIGRP? Or do I have to set up static routes that specify a default gateway? I'm guessing I have to setup NAT, but I'm not sure about that either.

 

[burtsbees]

You can indeed use a Cisco router separate networks---a switch is used to segment networks. What I am saying is that you must connect the router to the modem, put the modem in bridge mode, configure the outgoing interface of the router with ip address dhcp, or configure it with an ip address in the same network as the ethernet interface of the modem, and configure the router as the NAT device.
Also, to get rid of the acl...
router>en
router#conf t
router(config)#no access-list 1

Burt