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05.21.2004 at 07:33AM PDT, ID: 20997692

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5.8

How To Detect My Router's Public IP Address From Inside My Own Network

Zone: Miscellaneous Web Development

Tags: ip, router, my, address, how

Greetings All,

I have a web application that is installed at numerours remote locations (I know, not the best solution, its the way my boss wants it). I have an install package that installs the web application for the user. Anyway, when the web application is installed I want to detect the router's public ip address. Anyone know of a quick and easy way to do this programmatically? Preferably in VB.net or javacript.

Thanks,

CodeYankee

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Question Stats

Zone: Web Development

Question Asked By: CodeYankee

Solution Provided By: vikram_1982

Participating Experts: 23

Solution Grade: A

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05.21.2004 at 07:38AM PDT, ID: 11127109

Caiapfas:

yes, if its one of the linksys / home routers goto http://192.168.1.1/ in your browser window, and type admin/admin as user/pass, then one the first page it will show the wan ip address.

if not,
What connect do you have?
what type fo router?
Static or dynamic ip?

05.21.2004 at 07:48AM PDT, ID: 11127214

CodeYankee:

Yes, that will work manually. I am looking for a solution that allows it to be done programmatically. For example, in VB.NET I could get my own ipaddress by calling System.Net.DNS.GetHostByAddress(), but this only gets me the ipaddress for the local machine. I want the public IP Address for my router.

Any other ideas?

05.21.2004 at 08:18AM PDT, ID: 11127546

ChristianRocher:

You can't get the public IP address of your router because you are not in the good side because only another computer out of your lan can see the router IP Address. There is two common solutions :

1/ By Program : Use a site lik http://www.whatismyip.com/ (ther are several sites like this one) to get an html file and parse it with a regular expression parser to get the IP Address

2/ By Program : if you can get the status page of your router, then get this html file and parse it with a regular expression parser to get the IP Address

I have a prototype program in CSharp of this, if you need it as example then let me known and I'll send it to you.

05.21.2004 at 08:45AM PDT, ID: 11127797

AshleyBryant:

Well, assuming you have a web server out there that this stuff is downloaded from. Why not just make a webpage on a remote server that responses out the REMOTE_ADDR Server Variable? That way you don't have to parse out a ton of crap.

05.21.2004 at 09:15AM PDT, ID: 11128052

CodeYankee:

Ya, that was my solution. My boss is a friggen idiot when it comes to web development. He wants everything to remain at the remote location. Any other ideas???

05.21.2004 at 09:25AM PDT, ID: 11128129

AshleyBryant:

hmmmmmmmmm.........

I don't know how you can get the router's IP internally without having to code specifically for different routers. I think you could pass a username and password to a linksys or similar router and get to the page that shows the external IP address, but damn what a pain in the ass...

Example on a linksys: http://[router username]:[router password]@192.168.1.1/whatever-the-file-is-that-shows-the-ip.html

You'll still have to parse the output like Christian said using RegExp

05.21.2004 at 09:31AM PDT, ID: 11128180

vikram_1982:

Just a thought, not sure if it is viable though...

Is it not possible to do a trace-route (ping basically with a hop count of just 1). This should return the IP Address of the first wouter that it passes through. Should be easy to do in Java or C#.

This is from DOS..

D:\Documents and Settings\Vikram>ping -r 1 www.yahoo.com

Pinging www.yahoo.akadns.net [66.94.230.42] with 32 bytes of data:

Reply from 66.94.230.42: bytes=32 time=281ms TTL=47
Route: 203.145.184.1

The "Route" is the id of my external router in this case..
Try to do this programatically..

Vikram

Accepted Solution

05.21.2004 at 09:40AM PDT, ID: 11128260

AshleyBryant:

One problem I can see with this is in the instance where the router is behind another router behind another router, etc.

Big companies have this kind of situation sometimes.

05.21.2004 at 10:34AM PDT, ID: 11128670

vikram_1982:

A Router behind a router, behind another in the same network??? This is the first time i am hearing of such a thing..

Why will such a setup be necessary? I am not sure. I have knowledge of switches and bridges and hubs being used behind routers to increase the capacity, but a router behind another router is something i need to look into.

Still, i would reckon that if this is the case, you would never know. How can u determine how many routers there are between the external router of the network and the router to which a particular system is connected to.

Maybe.. u can incrementally perform this ping operation until a time you dont get a 192.168.0.0/24 address.

I guess you can understand what i am trying to say....

Vikram.

05.21.2004 at 10:36AM PDT, ID: 11128681

AshleyBryant:

Don't question it... Just go with it. The point is people do stupid things and he has to work with it. Haha

05.21.2004 at 10:38AM PDT, ID: 11128695

vikram_1982:

>>> I have a web application that is installed at numerours remote locations <<<

I believe that you are storing the web application in the web server. I can almost guarantee you that the web server will be behind a single router of the network. If it behind a router, behind another, then the web server would get a local LAN IP Address and it will not be accessible by the outside world. So, i would say it is a safe bet to go ahead with the ping program.

Vikram

05.21.2004 at 10:43AM PDT, ID: 11128730

vikram_1982:

Anyways.. Let us not be banging our heads about something hypothetical as of now.. Let us see if the author of this thread really has this requierement or not..

:)

Vikkki

05.21.2004 at 10:44AM PDT, ID: 11128733

CodeYankee:

Vikram,

I like your solution. I am going to test it out. Unless anybody comes up with something better, you get the points. Give me a day to test this out first.

05.21.2004 at 10:45AM PDT, ID: 11128750

vikram_1982:

Sure man...

Vikkki

05.21.2004 at 11:09AM PDT, ID: 11128929