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Dated: Oct. 28, 2013
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Networking In GeneralIP and TCP networks use routing tables in order to determine where the messages they forward should go. If you look at the routing table itself, it is a database, very small, and the thing that controls it is the software and hardware that is in the router.
Routing Table Entries and Sizes
Inside a routing table there are various IP addresses. Every single one of those addresses stands for a certain router or gateway. And also every single one of those addresses caries information that stands specifically for that router.
In a standard house router is a tiny routing table. This is because all home routers do is hand all the traffic that is outbound to the ISP (service provider) gateway, and then that gateway does everything it is supposed to do. In a standardized domestic router you will commonly find a small number of entries, usually ranging somewhere around ten or less. On the other hand, the largest entry a router has is well over one hundred thousand, and it keeps growing because the Internet is always growing.
You can see some examples here:
IP Address: 172.48.11.181 - Network Mask: 255.255.255.255
IP Address: 192.168.1.1 - Network Mask: 255.255.255.0
The first entry you see above stands for the primary DNS server. If somebody makes a request inside a house network it will be sent to that number (172.48.11.181). The second one is the same, just for two home computers inside a network.
Dynamic vs. Static Routing
Dynamic routing is something that refers to the process when domestic routers set up their routing tables automatically. The will create a single routing table for every DNS server, and a single entry between domestic computers inside a network. Also, several other tables might be created.
You will see that the most common thing for almost every single domestic router is to stop you when you try to override or set up a different routing table.
But, on the other hand if you look at a typical business router will do the exactly opposite, they will allow you to do exactly that. This thing is called static routing, and it can be somewhat useful for tweaking your router.
Viewing the Contents of Routing Tables
If you are seeking to see the content of a domestic router, you need to look on the screen that is located inside the administrative console. Also, a different way to do this is to, if you Linux or Unix, use the netstat-r command and you will see the content.
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