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A router "routes" data packets from one location to another; Usually from different subnets. Routers move packets from one subnet (or network) to another subnet (or network).
Routers can also be made to drop packets like Pings (ICMP requests). Routers can also disallow or allow different machines (via IP address or Mac address) access to different parts of a network. This is usually done with Access Control Lists (ACL's).
I hope I helped. I could have gone into great detail but I tried to keep it simple
We answered the router questions before we hi-jacked his thread. Need more router detail? I can get into a bit more
A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISPís network. Routers are located at gateways, the places where two or more networks connect.
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.
The above info found by doing a simple search on Google