Subj : Re: Where does the LAN end and the WAN start?
To   : Michiel van der Vlist
From : Tony Langdon
Date : Wed Oct 19 2016 07:35:00

-=> Michiel van der Vlist wrote to Tony Langdon <=-

 MvV> I knew someone was going to mention firewalls. ;-)

:-)

 MvV> More or less the same here. With the difference thatnon of the devices
 MvV> is fully exposed. So one could argue that the firewall is the boundery
 MvV> between te WAN and the LAN.

Especially in most cases of home networks, the firewall is also the termination
for the off-site link (DSL, cable, fibre, etc).

 MvV> Eh... but wait. Which firewall? My router does packet filtering, but so
 MvV> does my ISP. Port 25 is filtered here. ( I don't like that, but the
 MvV> fact is that it is..) So... the ISP has some kind of firewall too. So
 MvV> where does the WAN begin? Behind my own firewall, or that of my ISP?

Unless you're co-sited with your ISP, that argument doesn't make sense, because
there is at least one off site link between you and the ISP - a WAN link. :) 
In this part of the world, at the physical layer, my Internet link is a 4.7km
DSL line, but by the time you get to the IP layer, the first hop is at least
150km.  Hardly a "LAN" in either case! :-)


.... Southern DOS> Ya'll reckon? (Y)ep/(n)ope
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