Note that this tutorial is specific for the Linksys Etherfast Router family. If you have a different router, visit the Port Forward website. There you will find port forwarding and triggering instructions for just about every router that has those capabilities.
In this tutorial, we'll use port triggering to make Identd work and port forwarding to make DCC work. The beauty of using Port Triggering is the overall simplicity. It doesn't matter whether you've configured your network with a DHCP server or assigned each computer IP addresses manually. The router doesn't care. With port triggering you're simply setting up "services" that don't need a specified IP address. Port forwarding is a bit different. In this case you are assigning specific ports to specific computers. If you have more than one computer on your LAN, and the router assigns local IP addresses randomly, port forwarding can get screwed up. As a result, I recommend that you manually configure each computer so that it has a fixed local IP address. This means turning off DHCP.
