Yeah, it's me - *that* guy again.
Seems like the wired ethernet is not working, just the local loopback on dCorePlus-Stretch and dCorePlus-Stretch64. This is the actual port, not just a gui thing.
Both picked up my wireless cards on different machines, and had no issues doing sce-import / loads of my favorite toys so I'm assuming dhcp is up and running with those.
But the ethernet thing has me looking around to see if I need to jump-start something on my end first...