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Date: Fri, 21 Jun 2024 09:18:49 +0000
From: Mark Lawrence <mark@rekudos.net>
To: Nohk Two <nohktwo@gmail.com>
Cc: WireGuard mailing list <wireguard@lists.zx2c4.com>
Subject: Re: How to detect the IP CAM on LAN from WG tunnel ?
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>How do you solve this problem ?

Iterative fact checking, from the lowest levels of the network stack 
to the highest.

     - Are the devices actually connected where you think they are?
         - With the tunnel disconnected, does your phone connect to the 
           camera?
     - Is your Wireguard tunnel set up properly?
         - Can your phone ping the wg0 address with the tunnel active?
         - Can your phone ping other .100 devices with the tunnel 
           active?
     - Does your eth0/wg0 machine have IP forwarding enabled?
         - sysctl net.ipv4.ip_forward=1
     - What does packet tracing show?
         - I.e. `ngrep -d wg0 .\* icmp` or the tcpdump equivalent, also 
           against eth0 for the wireguard UDP port.
     - Does the mobile App actually support remote (routed) cameras or 
       just on the local network?

-- 
Mark Lawrence