I have this setup at my house. With the exception of the router, I am using a 2600.
I have two Ethernet interfaces faste 0/0 is connected to the cable modem via a cross over cable and faste 0/1 connects up to my home network.
You may want to do a search on NAT on Cisco’s CCO web site.
I believe I have it setup like this.
ip dhcp exclude-address 192.168.101.1 192.168.101.4
!address 1 - 4 reserved for network equipment
ip dhcp pool 101pool
network 192.168.101.0 255.255.255.0
default-router 192.168.101.1
dns-server 208.44.70.1
!Default-router is the ip address of router
!interface connected to home network.
!dns-server is the dns server that you ISP as
!Provided. Get this info from your PC "winipcfg"
Ip address-pool local
!I forget why this is here
Interface FastEthernet0/0
ip address DHCP
ip nat outside
no ip mroute-cache
!FastE 0/0 pulls its address from the ISP
!IP nat inside makes this the interface that does
!the NAT for outgoing data.
interface FastEthernet0/1
ip address 192.168.101.1 255.255.255.0
ip nat inside
!ip nat insides causes the 101 network to be NATed.
ip local pool 101pool 192.168.101.1 192.168.101.254
!sets up DHCP pool 101pool
ip nat pool ovrld 216.228.166.163 216.228.166.163 prefix-length 24
!After the first interface has been configured do a
!sho int to find the ip address.
!There may be another way to do this but this works
!for me. The 216.228.166.163 address is the address
!that was supplied by the ISP via DHCP.
ip nat inside source list 7 pool ovrld overload
!sets up an access list.
access-list 7 permit 192.168.0.0 0.0.255.255
!This is the access list.
