For the very first time i tried to selfhost a static site (lighttpd + duckdns) but I’ve failed… Is it even possible to selfhost a static site from “router 2” while i’m behind two routers? “Router 1” is from ISP and i have no possibility to change any settings except subnet, standard gateway, dhcp on/off and DMZ. -> no port forwarding. "Router 2 is Asus with port-forwarding available and i’m using an OpenVPN configuration on it (if that matters). DuckDNS could see the external ip from R2, but i couldn’t access it.
Probably because the ISP modem/router has limited capability.
I’ve done 2 routers like this for years (out of laziness more than anything) because cable modem router suck from a capability standpoint.
that’s exactly why.
The actual cable modem can run in passthrough mode though. Look up the model and find the docs. Should be a quick and easy change, or your ISP at least should able to change it. It would be absurd if not.
the ISP locked their router. I have to go the the ISP’s site, login and change settings there… can’t even change DNS on ISP-router.
That’s a bummer. Have you asked them about running it in passthrough mode?
No I haven’t. First i got to educate myself what these different modes are…
Passthrough in this sense just means that the ISP cable modem only acts as a modem, handing off all traffic to your router to control. Essentially it just disabled NAT so you won’t have double-NAT’ing happening. It’s a standard setting on all cable modems, so I know that part is possible, but it’s more about getting your ISP to enable that if they have it locked.