[Raion]

For testing and development purposes, thought I'd discuss how I do this and keep my network safe-ish. 

Systems involved:

Kosmos - an RPi4 running NetBSD 9
Murasaki - A Tezro (You need a Chimera for this to work) 
Yomi - A utility server running FreeBSD
Edge - My router

So in my router, you forward a port. I usually like to avoid direct SSH/HTTP/whatever ports and use alt ports, so for this tutorial I'll use 6022 as the exposed SSH port. Local SSH is always 22 though. 

So, gettiing my router's IP, I do:

ssh raion@routerip -p 6022

6022 is forwarded to 22 for Kosmos

So, to power on/control Murasaki, I do:

kosmos% ssh service@yomi

on Yomi is a detached tmux session with a screen session connecting to my USB-Serial adapter with the following command:

screen /dev/cuaU0 38400 

If it's not clear, device file then speed for port. Tmux just allows multiple users to grab the session easy. 

tmux attach

Then I can get to L1 with CTRL-T

Now I have dropbear and stuff on IRIX, so once booted using "power up" I can just do:

ssh murasaki

Any questions or help i can provide? Technically I could cut Yomi out, but proximity was a concern (kosmos and Murasaki are not close physically speaking)