networking - Port forwarding on local network

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My router is forwarding both ports 80
& 443 to my Linux (Ubuntu 16) box...and everything works
great.

To access my Linux box from my laptop
(Windows 7) I only have to type in my public IP address and...whether my laptop is
connected to the same router as the Linux box or not...I am able to connect all the
same.

My question
is:

If my laptop is on the same local network as
my Linux box and I connect by using the public IP address (not the local one), will the
connection be routed via the
ISP?

I'm
not sure whether this question belongs on servefault or superuser.

Answer

via ISP, no.

The router will show that
public IP as locally connected to the wan interface on your router, the packets will
never leave that device and be returned back to your local
IP.

You can think of this similarly to accessing
your computer at 127.0.0.1 or 192.168.0.10 (as example, your computer is at
192.168.0.10)

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