How to create cheap four wires untwisted ethernet cable for short distance

[neonix]

You don't have to buy UTP eight wires cable to create local LAN network.

You can use any wires you find, with 100BASE-TX standard, and IEEE 802.3u-1995 specification.

I don't know what is maximum distance, but it work in short distance in home bulding, between rooms. If you have modern switch/router you don't have to care about crossover.

https://www.reddit.com/r/HomeNetworking/comments/zddylt/ethernet_over_untwisted_phone_lines_it_works_how/

[gadget42]

after glancing frequently in the garbage bins most everywhere, we have a never-ending supply of cat5 and cat6 raw cabling of many various lengths. even pieces that had somehow been physically damaged(rodents?) and were used to pull in new cabling are fine to cut down for short runs. just make sure to put new ends on them and always mark and test them before usage(keeping good documentation/notes is wise, ymmv).