I?m trying to get a Cisco1721 WIC0 1ENET working behind a cable modem.
 I can ping the router from the inside, I can ping the cable gateway,
but I can?t seem to get the NAT working with the gateway.  I have a
few servers on the inside that I would like to NAT into them and a
workgroup that is on the inside that will use a certain IP.

I?ve taken a look at this with no avail: 
http://www.cisco.com/en/US/tech/tk86/tk89/technologies_configuration_example09186a0080094be1.shtml

Seems I?m still missing something.  I?ve tried both a crossover and a
straight through cable to the cable modem just in case.
////////////////////////////////////////////////
My config looks like this so far:  
////////////////////////////////////////////////

show run
Building configuration...

Current configuration : 1107 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname CORP_CABLE
!
enable secret 5 
enable password 
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
no ip routing
!
!
ip dhcp excluded-address 10.10.10.1 10.10.10.99
!
ip dhcp pool CLIENT
   import all
   network 10.10.10.0 255.255.255.0
   default-router 10.10.10.1 
   dns-server aa.bb.cc.222 aa.bb.cc.223 //My internal dns server.  
!
ip audit notify log
ip audit po max-events 100
!
!
!
!
interface Ethernet0 //This connects to the Cable Modem 
 ip address aa.bb.cc.11 255.255.255.240 //One of the available public IPs
 ip nat outside
 half-duplex
!
interface FastEthernet0 //Inside facing switches
 ip address 10.10.10.1 255.255.255.0
 ip nat inside
 no ip route-cache
 speed auto
 full-duplex
!
ip nat inside source list 102 interface Ethernet0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 aa.bb.cc.10 //This is my Gateway IP provided
from my ISP and is active.
ip http server
ip pim bidir-enable
!
!
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
ip nat inside source static tcp 10.10.10.5 80 aa.bb.cc.12 80
//Forwards outside ip to inside http?
ip nat inside source static tcp 10.10.10.5 21 aa.bb.cc.12 21
!
snmp-server community public RO
!
line con 0
line aux 0
line vty 0 4
 password 
 login
!
no scheduler allocate
end

I can?t figure out how to get this working!  I have a diagram of what
I?m talking about here: 
http://img211.imageshack.us/img211/8757/networkzo8.jpg

Please help me with a working config, this is stressing me out!