Is it possible without admin permission?

[NoapMat]

Title says it.

I'm trying to run it on a unprivileged user. Is this even possible without having to log in with admin?

[VaradGupta23]

No, you cannot use gnirehtet (or any reverse tethering via USB) without administrator (root/sudo) permissions on the host machine.
You will see errors like:

java.net.BindException: Permission denied
Cannot bind to port or set up VPN