Thank you everyone for the above routing short-course.
The last paragrpah Drinkingbird's about the rmodem responding back to my LAN makes the most sense to me.
Have been out of the field for quite a while, but do remember when Class A, B, C addresses and netmasks were really important at that...
Thank you everyone. I guess I should have asked the question this way:
Why did the route succeed at all given that 192.168.0.0/16 ( Range: 192.168.0.0 – 192.168.255.255 ) are defined as non-routable addresses? The modem is definitely sitting on the WAN port of the AX-3000 at 192.168.100.1...
I have a very simple setup: AX3000 router ->(Ethernet "internet" WAN port) ->Arris SB8200 modem (Ethernet port)->Comcast Cable
LAN Address: 192.168.50.x (router @ 192.168.50.254
Modem address (fixed by mfg): 192.168.100.1
I would think that the modem's web server (192.168.100.1) should not be...