You could use the driver from here:
https://download.opensuse.org/repositories/home:/Sauerland:/hardware/openSUSE_Leap_15.6/x86_64/r8126-ueficert-10.014.01-lp156.3.1.x86_64.rpm
https://download.opensuse.org/repositories/home:/Sauerland:/hardware/openSUSE_Leap_15.6/x86_64/r8126-blacklist-r8169-10.014.01-lp156.3.1.x86_64.rpm
https://download.opensuse.org/repositories/home:/Sauerland:/hardware/openSUSE_Leap_15.6/x86_64/r8126-kmp-default-10.014.01_k6.4.0_150600.21-lp156.3.1.x86_64.rpm
Download these 3 rpms and install them.
They are build from the Realtek sources.
PS:
Next time please use Code-Tags for posting something from Terminal:
Code-Tags