Home LAN not reachable when using certain networks

Technical Support for Routers VPN, DNS, Leaks
1

I have a GL AXT1800 which connects to my Draytek router at home using a Wireguard LAN 2 LAN connection. When connected I'm able to access all my local LAN devices such as domotica etc. Very happy with this.

This worked fine with all networks I connected so far.
Currently I'm on holiday and connected to the hotel wifi and the LAN 2 LAN VPN is active but I'm not able to access any devices on my home LAN.

The weird part, at least for me, is that if I connect to my phone's hotspot, I am able to access the LAN devices at home. But as soon as I change back to the hotel wifi I can't access my local LAN devices anymore.

I've checked and in both cases I browse the net using the IP of my internet connection at home. The only difference seems that when using the hotel wifi to connect the Wiregaurd LAN 2 LAN I'm not able to access my home LAN. When using any other network, at least so far and for example my phone hotspot, I can access the home LAN devices through the Wireguard LAN 2 LAN vpn.

Any idea where I should start looking?

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2

I assume the Wi-Fi in the hotel uses the same network as you use at home?
In that case, there will be a routing loop, and you can't connect.

3

Here are some parts of my Wiregaurd VPN client config

[Interface]
Address = 192.168.8.1/32
PrivateKey =...
DNS = 10.x.x.x
MTU = 1420

[Peer]
AllowedIPs = 0.0.0.0/0
Endpoint = x.x.x.x:51821
PersistentKeepalive = 25

And some information about the hotel wifi

  • IP Address10.0.10.142
  • Gateway10.0.0.1
4

My home network is within the 10.x.x.x range and also the hotel wifi also

Any way I solve this without changing my home LAN configuration?

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5

I don't know any way, without changing your home LAN range, no.
Maybe Tailscale or ZeroTier might be able to solve it - but I would say it's a general routing issue.

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