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Hello,
I'm confused about the networking modes of Virtualbox.. Which networking mode should I use in my virtual machine, in order to satisfy that it will be impossible to detect that host machine and virtual machine have a relation..

For example; I want to visit a website from the host machine and the virtual machine on that host at the same time, but I don't want to give any clue (same ip, or another same footprint, whatever it can be) that will show that those two machines have a relation..

Which networking mode should I use for this case in my virtual machines?

Thank you vey much to all who will contribute...

No matter what Virtualbox networking mode you use, you will be browsing through your one internet channel, and the internet IP address provided by your ISP will be the address the website sees from both host and guest. You need to get two public IP addresses from your ISP, and configure two physical modems/routers to put internet into two physical ports on your PC. Then you can have host on one IP address and guest on another.

There may be some internet service run on the host or guest which masks your IP address and makes it appear as if your host or guest is browsing from somewhere else. Tor, maybe?

Thank you very much for your reply... Then let me ask one further question... Think of this situation: I have the host and 2 virtual machines on it... First I surf on internet via host computer, then I change IP and turn on 1st virtual computer and surf internet only within the 1st virtual machine with the fresh IP, then I turn off 1st virtual machine and change IP again and turn of 2nd virtual machine and surf on the web only within the 2nd virtaul machine... In such a case, does networking mode make a difference for leaving footprint behind that will show that those 3 machines (host and 2 virtual machines) have some kind of a relation? In otherwords, in such a case, which networking mode should I use to prevent from being detected? Only changing IP is OK? Or some sort of other machine information (ie. networking card ID) is broadcasted while I surf on the web?

does networking mode make a difference for leaving footprint behind that will show that those 3 machines (host and 2 virtual machines) have some kind of a relation

The physical network card's MAC address might be seen, just as a wild guess. I've never tried such a thing before, so I can't say for certain. You could try it against a web server set up in a Linux PC at a friend's house, and see what information comes over.

FWIW, this, from your first post:

visit a website from the host machine and the virtual machine on that host at the same time

probably won't be possible if you change the IP address between browsings. I think there's a network disconnect somewhere in there, so even if possible you probably can't do two simultaneous sessions.

Open this https://www.whatismyip.com/ in your guests. It should tell you everything you need to know.

Your answers helped me very much... Thank you for your kind assistance.. Wish you all the best...