Router Design

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Questions about gateway and router ip address. Info on details?

Okay on my system information, it says IP Adresss. the right below if, it says gateway. What does gateway mean? Is gateway the router? How can i tell? Finally how can i even tell if my router is using a seperate ip address compared to a regular public IP address. I think it probablly is, but i can't find the router ip address anywhere and I just wanna be sure? How can i found it, if it even has one?

Public Comments

1. A router can not use a public address inside the network. It must have a public address but must separate that from the internal machines. The gateway address is the router address INSIDE the network.

2. Public IP Address (Internet) == http://www.showmyip.com
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Private IP Address (PC) ==
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PC Command Line:
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Click [Start] - Click [Run...] - enter: cmd, Click [OK]
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At the prompt (c:\.....>) enter: ipconfig /all, press [ENTER]
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3. You computer can talk directly to the devices that are on the same local network. When it gets an IP address that it wants to communicate with and it cannot do it directly because it is not on the same local network, it sends it to the gateway and lets it figure out how to get it there.

The gateway on a home network is usually your router. By definition you are sending your data to the gateway to be "routed" to its destination. How can you tell? Bring up that address in your browser and for most home routers you will get into the configuration for the router.

Your router MUST use a different address inside (your network) than it does outside (internet). The outside is a public address, or possibly a private address of your ISP. Your inside address is normally what is called a non-routeable address. That is, it cannot be used on the public internet. Only on inside private networks. The outside address of the router may change depending on how your ISP works. Most of the time you cannot assume it will stay the same. As a matter of fact, some ISP make you pay a premium for a fixed IP address. If you really want to know, you can to into your router configuration like I described above, and it should be in there, probably under a category called network or something like that.