I have a Cisco 2651 Router and i have broadband cable internet. I have the ethernet cable from my switch (network) plugged into FastEthernet 0/1 and the ethernet cable from my cable modem into FastEthernet 0/0. When i connet to console i can ping google.com as well as any internal IP address & Hostname. Computers on the network can ping each other but not the internet. So i assume i need to route my traffic from the network to use FastEthernet 0/0 for outboud routes, i also do not have a Gateway or last resort configured as my IP address from m cable provider is dynamic, it doesn't change often but still but still does from time to time. So i m worried that if it changes and is set as a default route or gateway then i will constantly be changing this and losing service until i manually change to the new IP.
SO basically i am looking for a way to have the two interfaces communicate and act in a way similarly to a basic home router like the ones most people have where you have a WAN port and LAN port. really simple in concept and so far i am half way there.
please help. thanks so much