for various reasons i have two routers. (In fact, one is a FritzBox hosting various SmartHome stuff, another is a Speedport from Telekom Germany, that also does the Internet Connection)
The WiFi on the FritzBox is also a lot better and right now i don't have any need to get anything better (all that matters has Rj45 anyway).
This however also is an issue, because i can't easily host something. I have however a Hetzern Server as well and i have tried some zerotier, but i have failed to set it up correctly. Is there an easier way or has anyone something like an How-To for this that works?
Do either routers support going into what's called an AP access mode instead of router? If they do then you could put one into access point mode and run a patch cable between the two.
No WRT for either of them and yes, it does support AP Access Mode, but i don't want to put them in to it, beacuse i actually want the networks to be separate
So you probably won't be able to without a router that is capable of supporting VLANs (not just vlan tagging). If you aren't looking to spend any extra money and have an old computer lying around you could look at getting a multi port network card and running pFsense/OPNSense as an inexpensive alternative.
I have VLANs, but they are more or less switch based and there are no direct routes between them. The basic gist of it is, Telekom switches back to DSL only, if it detects VPN traffic. And that's only 2 Mbit/s upload. However, with the 5G Hybrid and SSL Connections on Port 443 i do get the full 60-90 Mbit/s upload. I could just put the Telekom router in my "main" network and have it be the Gateway, but that doesn't go well with some devices i have.
Yeah it sounds like you're still going to need something that can support VLAN routing not just hard coded VLANs or isolated guest networks. If one of your other devices happens to be a desktop that you can run a small VM on you could potentially run pFsense as a VM then buy a 2 or 4 port gigabit pcie card as a stop gap until you find a better solution. You could even do the same with a laptop and say a USB ethernet adapter or two. Neither of those options would be better than having a dedicated device acting as the router though.
You might also be able to something with say a cheap managed TP link switch but that would really depend I think on what the rest of the network is doing.