I have a Nextcloud server installed at home that works well on my LAN network, but when I try to make the server accessible via a DynDNS service, I cannot connect to it. The request doesn’t even reach my server. My question is whether the router immediately blocks the request, because when I set the router to be accessible (it has separately that option), I can connect without any issues over dyndns url. Could my ISP (O2) be blocking it? I can confirm that it’s not a firewall issue, and it’s also not because I’m connected to the same WiFi as the server. It’s not a port forwarding issue either, as I’ve gone through all possible options. My router is a Fritzbox 6660, and there are no logs indicating that a request has even come through.
My second question is whether this is even allowed in Germany? Also, I’ve noticed that my ISP rarely changes my IP address; in fact, I haven’t seen it change at all in the past few months, which is strange because in my home country, it changed every 24 hours.
Edit: First, thank you all for your help. I will try your suggestions over the course of this week or month (due to time-related issues :) and will report back with the results. Since I am clearly a noob when it comes to self-hosting and I plan to have only a Nextcloud server for personal use, what is the best way to secure the system in these situations and allow only certain devices to access it over the external network? (if I ever manage to access it at all)
Do you have o2 DSL, o2 fiber, or o2 cable/coax Internet? O2 cable does not have a public IPV4 address by default, you need to request one from customer service.
The problem was with DS-Lite tunneling, as some users mentioned, and it only works over IPv6. However, now I have another issue. My entire family has access through their ISPs, but my cellular data ISP does not support IPv6. Is there any workaround that doesn’t require me to look for a new ISP or asking for IPv4 address? 😀 By the way, thanks to everyone for the help!
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Some German cable providers do internal NATting please check that yours does not.
Most likely you are under CGNAT, so your best bet is Tailscale, Wireguard, CloudFlare Tunnel or Zero Tier. Pick your poison.
Do you have o2 DSL, o2 fiber, or o2 cable/coax Internet? O2 cable does not have a public IPV4 address by default, you need to request one from customer service.
Yes.
I guess your Fritzbox does NAT for your LAN. Then the dyndns address works only when the client is outside.
The problem was with DS-Lite tunneling, as some users mentioned, and it only works over IPv6. However, now I have another issue. My entire family has access through their ISPs, but my cellular data ISP does not support IPv6. Is there any workaround that doesn’t require me to look for a new ISP or asking for IPv4 address? 😀 By the way, thanks to everyone for the help!
i would just ask for an Ipv4 address. I asked Vodafone for one and they just gave it to me for free.
O2 charges 50 € for that last I heard
That’s insane. I would consider a ipv4 -> ipv6 cloud hosted haproxy style setup if this was my only option.