It doesn't sound like you enabled NAT/PAT:
http://www.cisco.com/warp/public/cc/pd/iosw/ioft/ionetn/prodlit/1195_pp.htm
http://www.cisco.com/warp/public/556/nat-cisco.shtml
Try something like this:
interface Ethernet0
description Cable Modem Connection
mac-address 0008.a3f7.bd5d
! Some ISP's require you to register a MAC address. Make sure this is correct.
ip address dhcp
! If you can't issue the ip address dhcp command you need to upgrade IOS
! I think you need Version 12.1(2)T or better
! Don't use a static address if they require dynamic, this will cause problems
ip access-group 199 in
no ip proxy-arp
ip accounting output-packets
ip accounting access-violations
ip nat outside
no ip route-cache
no ip mroute-cache
ntp disable
no snmp trap link-status
no cdp enable
!
interface Ethernet1
description Internal Network
ip address 192.168.1.1 255.255.255.0
ip access-group 102 in
no ip proxy-arp
ip accounting output-packets
ip accounting access-violations
ip nat inside
no ip route-cache
no ip mroute-cache
!
ip nat inside source list 1 interface Ethernet0 overload
!
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 199 deny icmp any any log
access-list 199 deny ospf any any log
access-list 199 deny eigrp any any log
access-list 199 deny rip any any log
access-list 199 deny ip 10.0.0.0 0.255.255.255 any log
access-list 199 deny ip 192.168.0.0 0.0.255.255 any log
access-list 199 deny ip 127.0.0.0 0.255.255.255 any log
access-list 199 permit ip any any log
