Disabling temporarily the IPv6 on Linux

Use these commands:

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

Easy Easier Easiest Way to Transfer Files Same Network

If you live inside a comfortable jail then you can use AirDrop to share files, but if you are just a normal/ordinary person then you need to discover a nice alternative for files transfer called ShareDrop:

https://www.sharedrop.io

It will detect other people in the same network once they also open the site. It also possible to share files between Android, Windows, Linux, MacOS, iPhone, etc, using it.