Is there a driver for my CAC-1500 working with my M3 MacBook Pro,
Runnen OS: Sanoma 14.3
CAC-1500: USB 3.2 Gen1 Type C to Gigabit Ethernet Active Adapter
Download on the website is from 2019. RTUNICv1.0.19.dmg
Does it not work with Apple default drivers?
Can you show USB info of the device from System Information.app USB tab?
Did you try the 2020 version at https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-usb-3-0-software ?
Maybe read the following and search for M1, M2, M3
https://gist.github.com/MadLittleMods/3005bb13f7e7178e1eaa9f054cc547b0