Internet Networking Question

October 28, 2010 at 07:39:55
Specs: Windows 7
hi I've got a laptop and a desktop which are networked through a WiFi router and connect to the internet through a ADSL modem. Now my router has the scope range of to (IP Addresses faked). The router address being & the default gateway being

I am sure that even the next door neighbor could have the same configuration and same IP Address. Imagine my neighbor has the exact IP Addresses due to the same configuration.

Now when I request data from the internet, the internet would send data packets to the ip address which is the same gateway address for me & my neighbor.

Please could someone explain to me as to how the data would be sent to the correct computer inspite of both of us having the same router / default gateway address??

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October 28, 2010 at 08:22:17
You can't have two identical IP addresses on the same network.......period, end of story.

This is the reason ISP's provide clients with the IP addresses as compared to letting you pick your own. To avoid duplicating.

Let's say your external interface is up and running on the aforementioned IP address. As soon as someone else tries to bring that same IP address up, it will generate a "duplicate IP address error" and their interface will not work

The person who first had that IP will be warned about a duplicate IP but will be able to continue working.

Don't mess with your TCP/IP settings as assigned to you by your ISP whether they're static or automatic.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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October 28, 2010 at 08:35:33
On the other hand, if you are talking about IP addresses on the LAN side of the router, it doesn't matter.

The IP address of this computer is and a gateway address of There are probably thousands of other computers with the same IP address and the same gateway address, especially if they are using the same kind of router as I am and have stuck with the defaults. But it doesn't matter as they are private addresses that will only exist on a LAN.

As for faking private IP addresses, it is pointless as there are a limited number of them and they are all well known. Faking you public IP address is equally pointless because every time you send anything out over the Internet, you public IP address goes with it.


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November 2, 2010 at 12:08:34
Thanks a mill Stuart......

so you mean to say that the internet doesn't recognize my LAN (internal) IP of my comps?? but responds to an external IP which is unique?? and do we have anything like External IP??

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Related Solutions

November 2, 2010 at 13:12:29
Arun Conjeevaram are we doing your homework for you?

Or is this really something you are wondering about? If its something you are wondering about then google routing and read the articles. You will find them informative.

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November 2, 2010 at 17:23:41
so you mean to say that the internet doesn't recognize my LAN (internal) IP of my comps??

Not directly, but can be made to. Look up port forwarding and router functions

but responds to an external IP which is unique??

Yes, all external IP addresses are unique.

and do we have anything like External IP??

I don't know, do you? You must have to connect to the Internet,

Internal/external IP addresses are analogous to Private/Public IP addresses.

Look up both on Google. There a pages and pages of information, That's how I found out.


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