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Passive OS fingerprint masking (TCP/IP fingerprint)
Written by Yelena Varabyeva
Updated on February 19th, 2024
It's possible to identify a device's operating system by analyzing its network traffic. Variations in the TCP/IP stack implementations across operating systems assist in determining the OS that generated the package.
This set of OS-specific package parameters is known as an OS fingerprint. As this method entails observing traffic without sending requests, it's referred to as passive OS fingerprinting.
You can check this fingerprint on browserleaks.com/ip under "TCP/IP Fingerprint". In Multilogin you may encounter the following results:
- A proxy server intercepts your network packages and repacks them – that's why if you use a proxy, the above test may show an OS different from your original one
- If you use Multilogin on a VM, the above test may show your original OS regardless of the OS selected in the profile settings
TCP/IP fingerprint is a connection fingerprint, and Multilogin cannot affect it in any way. Websites, for the most part, ignore this parameter, since mismatches between TCP/IP Fingerprint and actual OS are common in normal traffic. They are caused by certain network devices and configurations.
Nevertheless, it's possible to mask this fingerprint on the proxy level by using services that specifically provide this type of masking solution – for example, iproxy.online.