/etc/modprobe.d/r8168-dkms.conf is in r8168-dkms 8.045.08-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # settings for r8168-dkms
# map the specific PCI IDs instead of blacklisting the whole r8169 module
alias pci:v00001186d00004300sv00001186sd00004B10bc*sc*i* r8168
alias pci:v000010ECd00008168sv*sd*bc*sc*i* r8168
# if the aliases above do not work, uncomment the following line
# to blacklist the whole r8169 module
#blacklist r8169
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