My Server sees my router's IP instead of client's

Question

I have a web-server that is behind a router. One of the servlets on that server relies on the IP address of the user, however, i often get the IP of my router (i.e. 192.168.1.1) instead of the real IP.

How can i fix that?

No, I had to find a different way out. Unfortunately, I don't remember what exactly I did. Basically, you can identify the user in other ways, like getting their session id, etc. — Ibolit, Feb 19 '15 at 07:34

score 4 · Answer 1 · answered Aug 28 '12 at 05:20

It sounds like your "router" is actually acting like a reverse proxy.

It is unlikely that you will be able to solve this in Java ... or even on your server machine. It sounds like a router configuration problem. You might be better off asking for help on "superuser" or "serverfault".

One thing to bear in mind is that identifying clients by IP address is always a bit dodgy. Even once you've sorted out the current problem, the real client IP address may not be available for various reasons:

The client's IP may be NATed.
The client may be talking to your webserver via a series of HTTP proxies.
The client may be spoofing its IP address.

Yes, but in this case it is guaranteed to be in my lan and controlled by me. — Ibolit, Aug 28 '12 at 05:21
... until you change your mind and run the application somewhere else. :-) — Stephen C, Aug 28 '12 at 06:05

Harmeet Singh · Answer 2 · 2012-08-28T05:26:18.953

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Grab your global IP from http://www.whatismyip.com/ , I think you might also need to configure port forwarding on router of user that is having servlet.

edited Aug 28 '12 at 05:26

answered Aug 28 '12 at 05:18

Harmeet Singh

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I know my global ip. Basically, i have two computers in my lan. One of them is running a web-server using tomcat+servlets. Another (say, ...32) makes a request to it. I need to be able to tell that IP from my servlet. Port forwarding also set up – Ibolit Aug 28 '12 at 05:20
If the request is local, then there is no need of port forwarding, can you please share that servlet code. – Harmeet Singh Aug 28 '12 at 05:24

score 0 · Answer 3 · edited May 23 '17 at 12:20

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I would suggest that access http://wwww.whatismyip.com to get you IP adddress in case you have not tried that way.You will more idea from this link.

Getting the 'external' IP address in Java

edited May 23 '17 at 12:20

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answered Aug 28 '12 at 05:19

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My Server sees my router's IP instead of client's

3 Answers3