how to identify remote machine uniquely in php?

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how to identify remote machine uniquely in proxy server environment, i have used $_SERVER['REMOTE_ADDR'] but all machines in proxy network has same IP Address, is there any way

Don't ever depend on information that is coming from the client. In this case, you're running up against simple networking problems (you can never be sure the client's IP address is correct), in other cases the client may spoof information on purpose.

If you need to uniquely identify your clients, hand them a cookie upon their first visit, that's the best you can do.

Identifying machine uniquely by PHP, What's a good resource to use for identifying a computer? Preferably using PHP. A project I'm working on needs to give users certain access  I work for a university, and i'm implementing a PHP web app that needs to have different behavior when it is visited from one certain computer. The problem i am running into is that from the webserver, using $_SERVER['REMOTE_ADDR'] and gethostbyaddr(), i can only identify the router that a computer is going through, and not a specific computername.

Your best bet would be :

 $uid = md5($_SERVER['HTTP_USER_AGENT'] .  $_SERVER['REMOTE_ADDR']);

however, there's no way to know if they changed their user agent or different browser.

How to identify a unique computer? - PHP, It is printed on the NIC(Network Interface Card) and is globally unique for every service provider(ISP) which uniquely identifies a system over the network. How to get the IP address of the connected client in PHP: $_SERVER is a PHP  identify a remote user uniquely The most reliable way, in my opinion, is to set a cookie. If you detect the same cookie coming back again, you'll know with 100% certainty that it's the same machine. But someone could clear the cookie or switch machines to bypass it.

How to get the MAC and IP address of a connected client in PHP , Static IP addresses that do not change very often that are provided to servers. The ISP provides a unique IP address to a home machine that is dialing via modem,  You may rely on cookies. Try to create some form of machine authentication, or better, machine identification page, browse it once from each machine telling the server which is the printer to use on that machine, and then set a permanent cookie on that machine.

I do not think there are other ways to do what you want. This is because the proxy server proxies the clients' requests and acts on their behalf. So, the clients are virtually hidden from the server's point of view. However, I may be wrong.

How to identify server IP address in PHP ?, MySQL on a remote server If you are accessing MySQL on a remote server, you database names that you create with a unique identifying string to ensure that  These, if used in the aggregate can help to ID a user's machine, but again are browser dependent and can be changed. Cookies - Setting a cookie is another way to identify a machine, or more specifically a browser on a machine, but as others have said, these can be deleted, or turned off by the users,

If you are aware of the proxy server, I think that implies this is some kind of company LAN. Are you in control of the LAN? Perhaps building and installing some ActiveX plugin which sends a machine-unique ID to the server might be the solution.

In general, HTTP proxy servers are not required to send the IP of their client. So every request sent by a proxy looks like it came from the proxy's IP. (Although the wikipedia has some mention of custom headers some proxies send to forward the client's ip.)

It gets even worse when an HTTP proxy is itself using another HTTP proxy - the server getting the request will only get the IP of the last proxy in the chain, and there's no guarantee that the 2nd proxy is even aware that the 1st proxy wasn't a regular client!

Learning PHP, MySQL, JavaScript, and CSS: A Step-by-Step Guide to , How can I get client IP address and store it to the variable called $ip using php+​apache? PHP has in built facility to detect remote browser,  Not to mention when it’s running on a virtual machine. With that, the days of using MAC address as a unique identifier of a computer is gone. Now what? Use UUID as the Identifier When You Can. We covered in the past that you can use the wmic command to find all the system info from your machine. And we can use the same too here.

PHP: HowTo Read an IP Address of Remote Computer / Browser , file uploads · Using remote files · Connection handling · Persistent Database Connections Chances are you'll not find it in your FTP tree. the destination filesystem doesn't permit chown() or chmod() system calls to be made on files in the target already so I wrote a small piece to append a unique number to each file. I was able to deal with simple brute force attacks since I can identify the user based on username/email and throttle their login based on failed login attempts per user account. But when it comes to user-enumerated brute-force attacks (a.k.a. Reverse brute force attacks), identifying the user becomes pretty hard.

rename - Manual, uploads · Using remote files · Connection handling · Persistent Database Connections · Safe Create multidimensional array unique for any single key index. I find it odd that there is no version of this function which allows you to use a comparator This tested on several different machines with 100000 random arrays. But, I need something that can identify a computer as unique regardless of the current session the user is logged in with. When you log in from the computer to the application, a new unique

array_unique - Manual, the code i am using in below example returns the mac address of computer using javascript, once you get ip address of computer you can send it to server (php script) Upwork can help your business find the remote talent it needs to succeed in millions of network ready products seemingly have unique MAC addresses? the code i am using in below example returns the mac address of computer using javascript, once you get ip address of computer you can send it to server (php script) using ajax. limitation of this code is, it works only in IE not in any other web

Comments
  • If just two people behind the same proxy use the same browser this doesn't work.
  • Exactly, there's no way to 100% be sure who it is, you can use combos of different $_SERVER vars and pray they would be unique in one way or the other.
  • X-Forwarded-For can be useful for this exact situation. You can't rely on it, especially for uniqueness, but it is useful.
  • I wouldn't suggest combining an IP address with USER_AGENT to identify people. Browsers like Chrome auto-update, which changes the string all the time. Some browser strings also reflect installed plugins which may change. Even if you just extract the browser name you're never really sure it hasn't been tampered with.
  • Please don't store number of failed login attempts in a session variable. In the end, $_SESSION is just another cookie tracked by Apache. The user would only have to delete the cookie containing the session ID to reset its failed login attempts. Instead, a good solution would be to save a timestamp of the last three failed login attempts for each user in your database. If all three of those took place within 5 minutes from now(), disallow login attempts.