= Сообщение: 3696 из 7440 ============================================= IPV6 = От : Markus Reschke 2:240/1661 17 Oct 16 11:29:22 Кому : Michiel van der Vlist 17 Oct 16 11:29:22 Тема : New candidate member FGHI : area://IPV6?msgid=2:240/1661+580242fe На : area://IPV6?msgid=2:280/5555+58040013 = Кодировка сообщения определена как: LATIN-1 ================================ ============================================================================== Hi Michiel!
Oct 17 00:14 2016, Michiel van der Vlist wrote to Markus Reschke:
MvdV> With IPv4 it is clear where the LAN ends and the WAN start. At the MvdV> NAT. Or more precise: with IPv4 after the coming of NAT. Because MvdV> before the coming of NAT the usual IPv4 situation was similar to MvdV> what we now have with IPv6. Every node had a globally routable MvdV> address. One could argue that the LAN is defined by the subnet, but MvdV> where does the WAN begin? I would argue that every node with a MvdV> routable global address is part of the WAN, and hence its address MvdV> is a WAN address by your defintion.
Too many D-Links and Netgears :) Ok, back to the basics. The terms LAN and WAN are related to network topolgy, not IP addresses or any other addresses or network protocols. LAN is the network in your data center, office or home. WAN is the network connecting several sites. In an IP network a LAN/WAN can use any IP addresses. There are WANs with RFC1918 addresses and LANs with public address space. There are also LANs with public addresses, which aren't accessible via the internet.
Connecting a LAN to a WAN is usually done by a router (including a firewall). For average Joe this is the D-Link or Netgear for 30 bucks. Those routers use RFC1918 and NAT for the LAN in most cases (IPv4). But this doesn't mean, that NAT implies a LAN. It simply means, NAT and RFC1918 addresses are used for that LAN. NAT can also be used in a WAN, like for MPLS based VPNs with RFC1918 addresses and one or two central virtual internet gateways (VRF instance tied to the VPN on a MPLS router).
A WAN address is not a WAN address, because it's a public one and globally routed. It's a WAN address, when it is an address of a WAN interface. The same for a LAN address. A public and globally routed IPv6 address on your PC's LAN interface is a LAN address, which is - you might guess it - reachable via the internet, unless you disable routing for it or filter it completely in your router. In the latter case the PC has a public IPv6 address, but can't access the internet and vice versa. Defining a LAN/WAN by the IP addresses used doesn't work.
And yes, your PC in your SOHO LAN is part of a large network consisting of tons of interconnected WANs and even more LANs, which is nicely depicted as the internet cloud :)
