STATIC ROUTING | |
A router or gateway is a hardware device that fowards packets from one logical network to another. IP uses a routing table to determine which networks that packets can be forwarded to and will only forward them to networks that it has been configured to do so. When a packet is to be sent, IP determines whether or not the IP address is local or remote. If it is local, it forward the packet. If it is remote, it consults the routing table to determine the path to the remote host. If there is no entry in the routing table, then the default gateway is used instead. The routing table is checked at the router and the process repeats. A packet can be forwarded from router to router. Each one of these steps is called a "hop". If a route to the remote host is never found then an error message will return. On NT, multiple gateways can be configured and if "Dead Gateway Detection" is set to "on" then IP will attempt to use the next default gateway. WOULD YOU LIKE TO KNOW MORE? Routing can be either static or dynamic. Static routing involves manually programming the routing table into the router. If you have a large network, this can be a real hassle especially if your network constantly changes and the tables have to keep getting updated. Let's look at how this all works...
In this example you can see that our router is actually a computer. If one adds 2 network adapters to an NT server, it can be used as a router. A computer that acts as a router in this way is said to be getting it in both ends. Just kidding - it is called multihomed. The default gateway of Host A in this example would be the local side of the router which would be 134.62.8.1. Conversely, Host B's gateway would be 134.62.20.1. And that is all I have to say about that. ROUTE COMMANDS 1) route add (IP_Address) mask (Subnet_Mask) (Gateway_address) 2) route -p add (IP_Address) mask (Subnet_Mask) (Gateway_address) 3) route delete (Subnet_Mask) (Gateway_address). 4) route change (Subnet_Mask) (Gateway_address.) 5) route print 6) route -f
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