[GLLUG] Adding a second ethernet interface

[Chris Bell]

Hello,
I have a box running KDE on Debian Testing (Stretch) which has an Intel on-
board gigabit ethernet (listed during installation as enp0s25) and a cheap PCI 
gigabit ethernet card (listed during installation as enp10s10). I expect one 
to carry a higher data rate (only from multiple IP security cameras configured 
on a single isolated network) than the other, (to be used for general 
connection and monitoring), so I opted to use the PCI card as the primary 
interface.
I could not find the onboard ethernet on any existing file, and want to add 
and configure it to use at least IPv4 with a fixed address, and optionally 
IPv6. NetworkManager is installed by default, which is supposed to make things 
easy, with a variety of helpful commands, but I find it just complicates 
everything, yet if I do not use an approved configuration procedure any 
settings are likely to be lost if NetworkManager is updated. Am I alone?

Chris Bell
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