It's Weird though LOCAL LAN PLAY directly on my network has issues....The Nintendo switches can ping each other, they have IPs in the local subnet and IP range, but with both of us set up on LOCAL NETWORK mode, neither of us can see each other...Nothing showes up under Matchmaking.....driving me crazy.
If anyone cares, I figured this out. Basically you can use the Lan-play Server project, and the relay server to solve all of this. It makes no sense to me why it dosen't work RAW on my Local network with locals IP's, I'm going to chalk it up to something with one switch being a CFW and one a regular, but really I don't care because the speed is nice, and it works. So here's what I did. Went here:
https://github.com/spacemeowx2/switch-lan-play/releases
Downloaded lan-play-Win64.exe, ran the file, added a server from:
http://www.lan-play.com/
Choose any one you want, literally just copy and past the Address and port, right into the lan-play-Win64.exe windows, when it asks for what server you want. For example I chose this server:
lan.imperialcommand.xyz:11451
Once lan-play-Win64.exe was running, and the server chosen, I set my CFW emuMMC switch to 10.13.26.49, subnet /16 (255.255.0.0), 10.13.37.1, DNS Can stay as 90DNS. You can literally chose anything in the 10.13.xxx.xxx range you want, as long as no one else on the server has it, just choose something wild and it will be cool. It has to be in the 10.13.xxx.xxx range, gate way HAS to be 10.13.37.1. That gives you a pool of roughly 65,000 addreses to choose from.
I set my regular switch to 10.13.26.53, same /16 subnet, same gateway as above that it has to be. It said both switches were connected to the internet (Which means they were connected to the relay server above), I could see from the command window for lan-play-Win64.exe, that packets were being exchanged to and from the relay server, and I could surf the internet, so i knew all was well. I went on Dying Light, selected LOCAL NETWORK, and loaded my game. I got my gaming partner to do the same. Once in the game we went to match making and BOOM, we could see each other's game, it was awesome. We're now doing the campaign together and life is rocking.
**Update** Oddly enough this magically worked for one day, and then quit working. Apparently Ncap can only have the one connection with lan-play-win64.exe...how we did it yesturday is beyond me...but today we just knocked each other off, and I finally gave up.
The bizarre thing is I have the most luck with local network play and dying light, using lan-play...until this happened.