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Getting a client's IP address

Posted on 1999-01-14
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Last Modified: 2013-12-25
I am interested in identifying a client which activates a cgi/servlet on my server. I would like to use his IP address as the identifier. How can I read this identifier in my cgi/servlet? I know the cgi variables REMOTE_HOST and REMOTE_ADDR give me some information about the client, but it is not necessarily his exact IP. I think it's only his network IP. Is there something else?
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Question by:ariefishler
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mouatts earned 200 total points
ID: 1830589
The IP address returned is the full, and only IP address, that you can get to. It is this address that the server will respond to when it sends data back to the client.

The problem is that if the client is behind a firewall or is using a caching proxy server then the IP address that you will see is the IP address of the proxy server. The real IP address is held by the proxy so that when you respond to it it will respond to the client.

If the client is not using a proxy the the IP address will be the IP address of the actual machine.

I am afraid there is no way around this as has been discussed and mentioned several times before in other questions.

As also stated the only ways in which a user can reasonably be recognised are.

1) To store a cookie which you can re-read on subsequent accesses.

2) Allow registered users through a password control mechanism and then track the user through the course of you site.

3) Implement the site via SSL and require a certificate. This is generally not an option at the present time as the use and understanding of certificates is so poor generally that you would  get no users to you site.

HTH
    Steve
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by:ariefishler
ID: 1830590
Thanks....was quite quick !!!!
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