Routers use headers and forwarding tables to determine the best path for forwarding the packets, and they use protocols such as ICMP to communicate with each other and configure the best route between any two hosts.

Very little filtering of data is done through routers.

See "Common Router Settings" in the Quick Reference section of Webopedia.
See also Webopedia's "Did You Know... Routers, Switches and Hubs: What's the Difference?"

Cisco Network Routers - Cisco Routers Are Adaptive And Resilient To Fit Business Needs.

GlobalSpec.com: Network Routers - Provides database of suppliers for network routers. Includes catalogs, technical information, and supplier contact information.

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EnterpriseNetworkingPlanet
EnterpriseNetworkingPlanet provides practical advice and news for running and managing an enterprise network. In-depth articles and news cover topics such as network management, network monitoring, servers, communications, Internet telephony, operating systems, and much more.

Open Networks Today
Networking news moves at a fast pace, and Open Networks Today lets you keep up with it. Open Networks Today offers its readers the ability to control how news is presented through customizing content filters, discussions, and news feed links.

PracticallyNetworked.com
PracticallyNetworked.com provides easy-to-understand help for small-network builders. The site contains how-to information for setting up and debugging home-office and small-business networks. Users can also find extensive troubleshooting information, tips on getting applications to work through firewalls, product reviews on network hardware and software, and more.

PracticallyNetworked.com - Router Product Reviews
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PracticallyNetworked.com Discussion Forums
If network connections, sharing computers, router problems or other networking issues are bogging you down, then the PracticallyNetworked.com discussion forum is the place to be. Here you'll find help and support for all your network-related problems.

Webopedia Quick Reference: Understanding Router Settings
A list of many common broadband wired and wireless router settings and a description of what function it performs.

Webopedia's Did You Know...The Differences Between Hubs, Switches and Routers"
Some technicians have a tendency to use the terms routers, hubs and switches interchangeably. One minute they're talking about a switch. Two minutes later they're discussing router settings. Throughout all of this, though, they're still looking at only the one box. Ever wonder what the difference is among these boxes?