What is the best way to obtain a distinct client identifier on the server?

Currently, I am in the process of creating an EventLog to track transaction logs on my website. This log will contain details such as the Public IP address where the transaction originated and also the local IP address associated with that public IP.

I have successfully figured out how to retrieve the Public IP Address, but I am struggling to find a way to obtain the local IP or machine IP from which the transaction was initiated.

A significant number of entries will be coming from multiple users connected through the same network. For example, 5 or 10 computers sharing one connection.

I am seeking a solution that will allow me to identify the specific machine IPs (e.g., 192.168.0.1 for one system, 192.168.0.2 for the next) involved in these transactions, as well as gather information about the Computer names...

Is there a feasible way to achieve this?

Answer №1

If you're seeking the private IP address of a client who is connected via a router, unfortunately there is no direct way to achieve this.

Is the sole purpose of obtaining this information to differentiate between users?

Have you considered utilizing an alternative approach such as cookies?

Answer №2

When dealing with clients connecting from behind a NAT or firewall, obtaining their address or computer name can be challenging. If this information is essential for your protocol, it should be part of the client's request, and they should willingly provide it. Verifying this information may require a trusted cryptographic infrastructure to establish trust in the client machines themselves.

Answer №3

Unfortunately, the answer is negative. Contemporary browsers do not reveal private addresses during HTTP transactions. The NAT-equipped router at the client's end only showcases the public IP address while establishing an IP connection.

Answer №4

Chances are slim. For more information, check out a brief conversation at

Answer №5

Indeed, we are implementing this process to distinguish between the various computers involved and identify who is making the entries.

Given that tracking IP addresses may not always be accurate, do you have any alternative techniques I could utilize for achieving the same outcome?

I simply require clarity on which computer each entry originates from.

If you have any recommendations, please feel free to share.

Answer №6

Your assumption that it is possible to determine the source computer for each entry is incorrect. There is no system in place to track this information, and most of the time it simply does not exist.

The only way to ensure that each computer can be uniquely identified is by taking the initiative to assign an identifier. This can be done through methods such as client certificates. If you require a unique identifier for each computer, you must establish one and have it linked to that specific machine. The computer can then send back this identifier when necessary.

There are no other means of uniquely identifying computers beyond this method.

Answer №7

While this may be more advanced than what you were initially seeking, it presents a fascinating topic for exploration: Remote physical device fingerprinting

This method allows for the unique identification of a remote physical device without its cooperation, even across NAT or other network configurations.

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