WAN IP address different from whatismyip.com

October 9, 2011 at 13:48:24
Specs: Windows XP
Trying to Remote Desktop Connect:
I noticed after setting up port forwarding (via 3389) to the IP address of the machine I want to RDC with that the WAN IP address shown on my router's status page is different than the IP address given by whatismyip.com. I can RDC no problem from computer to computer in my LAN. I thought that when I use RDC from work that I need to enter the internet facing address given to me by my ISP (WAN IP address). This should get me to my router and then my router will send me to the LAN IP address I have set port 3389 to send me to. I tried entering both the WAN IP address shown on my router status page and the one that comes up with whatismyip.com and neither work? Why is my WAN IP address different from the one on whatismyip.com?

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#1
October 9, 2011 at 20:27:10
Some ISPs bridge their network to you. Under these circumstances you can't port forward since that would have to happen on their router not yours. If you have private ip on the wan interface this is the case.

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#2
October 9, 2011 at 20:35:00
I little bit confusing... I will help with an example..
A and B are systems on LAN .. ( Let it be your office ) with R1 as ADSL/router, Static WanIP-W1
C is systems is somewhere not on LAN ,( let it be your home )

Our target rdp to A from C
now you can rdp A from B, Yes
But you cannot rdp from C

Now here is your process. In router R1 you need to port forward 3389 to A ( local IP Address and not Wan IP ). As when you do rdp from B to A you are giving Local Ip Address . The system a listening of Port 3389 on LAN IP.

Now sitting at C you will do RDP to Static WAN IP : W1

Suppose you do not have a static wan-ip at office and you have a dynamic , means which changes frequently, then when you will try to connect from C to A another other time , it will not connect as the WNA IP W1 would have changed to W2 or any other. So in such cases you need to have W2 value now ( changed WAN-IP ).
So it will be difficuilt for you to track these manually each time. To overcome this issue you should open a free account at Dyndns.com ( it is free for 2 IP tracks ).

Now inside DYNDNS.COM register a name for your office location eg office.dyndns.org.
In router there will be an entry of DDns , put your username/password and host name . Username is: account name at dyndns.com , password you gave to register , hostname is office.dyndns.org

So when ever you ip address of router changes it will automatically update office.dyndns.org .
So whenever you now do rdp to A sitting at C , you will just give office.dyndns.org to do rdp ( which will automatically resolve the WAN-IP of your office )

Vishal
http://www.floppytousb.net


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#3
October 10, 2011 at 10:37:55
" Why is my WAN IP address different from the one on whatismyip.com?


VISHAL CHOHAN that was the question that needed to be answered. Nothing to do with dyndns.


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Related Solutions

#4
October 14, 2011 at 21:48:15
OK everyone... as few of the answers posted here addressed the question I asked... i reposted the question in another thread and got the solution I was looking for.

For anyone following this thread, the reason my WAN IP address was not matching that of ipchicken was because I had another router hooked up between my modem and my home router. It was Vonage.

I had the Vonage box between my modem and my router. So the Vonage router was assigning a private IP address to the WAN IP adress in my router. I changed the configuration of my network so that Vonage is now hooked into a LAN port on my router.

NOW, the WAN IP address for my router matches ipchicken.com and NOW, i can use remote desktop connection from work to access my computer at home.


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