Machine A:
- Is running the HTTP server.
- Is connected to the router, which is connected to the internet.
- Has local IP 192.168.0.101. Is accessible through WAN at IP 66.46.168.204 (Which is the router's IP, I assume)
From there:
http://localhost:80/ -> Will reach the HTTP server.
http://66.46.168.204:80/ -> Will not reach the server.
Machine B:
- Is connected to the internet, and is not running anything in particular.
From there:
http://66.46.168.204:80/ -> Will reach the server.