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We have an actually simple VPN setup:

Data Logger ====== Router (VPN server) | ===(internet)=== PC

enter image description here

We are using this Wireguard configuration on the router:

[Interface]
PrivateKey = ...private key
Address = 192.168.115.201/24
DNS = 192.168.115.2
DNS = fritz.box

[Peer]
PublicKey = ...key
PresharedKey = ...key
AllowedIPs = 192.168.115.0/24,0.0.0.0/0
Endpoint = [some hash].myfritz.net:[some port]
PersistentKeepalive = 25

I do not get this line: AllowedIPs = 192.168.115.0/24,0.0.0.0/0: 0.0.0.0/0 means everything anyway, right? So why the first range 192.168.115.0/24?

But apart from that:

how can I connect to the local IP, the data logger via internet, but in the same VPN?

When I am trying this from the PC: http://192.168.x.x:80, I am getting a timeout. Although there is running a service on port 80 and it can be used in the local net (router, data logger, more machines...).

What am I doing wrong with Wireguard?

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  • It appears you have the same subnet inside the VPN and on the physical network. This isn’t a good setup, especially with WireGuard.
    – Daniel B
    Commented Jul 11 at 9:44
  • @DanielB So something like Address = 10.10.10.1/32 on the router (Wireguard config) might help? Or Address = 10.10.10.0/24 instead?
    – BairDev
    Commented Jul 12 at 7:52
  • Somewhat like this, but you cannot unilaterally change this. All peers need to agree. The WireGuard config you have appears to have been generated by an AVM FRITZ!Box router. I’m not familiar with setting up WireGuard on these devices, so I cannot offer further assistance, sorry.
    – Daniel B
    Commented Jul 13 at 17:43
  • I can reply after 5th of August due to vacations.
    – BairDev
    Commented Jul 17 at 11:07

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