Need 2 separate NIC addresses for VPN PC

VPN
1

So I’m building myself a VPN PC from a SFF pc.
I aim to use this attached to my Roku.
I will be using Tailscale as the remote client and I have added an additional Ethernet port.
However that is where I get stuck.

2 issues:

  1. The additional NIC port I added will load it’s drivers at boot-up and default to itself not allowing a connection on the onboard NIC.

  2. It’s my first VPN like this I’ve built and I don’t know how to configure things so that the IP on “NIC 1”(Local) is used for internet connectivity. But “NIC 2” will use the IP from Tailscale.

2

Btw, sorry about the spoiler bit.
I don’t post on Reddit much

3

Two MAC addresses requires two NIC’s.

4

Hello, I’d be grateful if someone might elaborate more with an answer that could help my progress.

5

I got that far, thanks