@JJ-Fullmer The r8152.c from the torvalds github site failed to compile on 4.19.65, I’m suspecting its for a later release of linux. The version from the torvalds site was 1.10.10. The version in 4.19.65 was 1.9.9 of the realtek driver.
I was able to compile the realtek driver from the wget github site. This version is 2.12. Here is a link to that kernel with the 2.12 driver built in. I also enabled the usb-c code in the kernel that appears to have not been set. I don’t know if its relevant, but it should be on for other applications. https://drive.google.com/open?id=1wZwwOwbEr0nR3mnPLKg7AsulwJaGhO0A
Download this as bzImageRT (watch your case) and copy it to the ipxe directory with the other kernel images. Manually register the host and then in the host definition add in bzImageRT as the kernel for that host. Then pxe boot into FOS Linux debug mode to see if the network adapter inits correctly with this updated driver.