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@@ -447,7 +447,7 @@ the blue routing area).
#### What are addresses?
Let's end this discussion with how all this relates to IP addressing
-and CIDR. Each "IP" host has 32 forwarding elements with a straight
+and CIDR. Each "IPv4" host has 32 forwarding elements with a straight
parent-child relationship between them [^12]. The rules above imply
that there can be only one peering relationship between two nodes. The
subnet mask actually acts as a sort of short-hand notation, showing
@@ -469,6 +469,17 @@ certain frequency), and then thinking that we either have to name the
box or the holes/antennas: the answer is _neither_. I will come back
to this when discussing multi-homing.
+One additional thing is that in the current IP Internet, the layout of
+the routing areas is predominantly administratively defined and
+structured into so-called Autonomous Systems (ASs) that each receive a
+chunk of the available IP address space, with BGP used to disseminate
+routes between them. The layout and peering relationship between these
+ASs is not the most optimal for the layout of the Internet. Decoupling
+the network addressing within an AS from the addressing and structure
+of an overlaying unicast layer, and how to disseminate routes in that
+overlay unicast layer is an interesting topic that mandates more
+study.
+
[UNDER CONSTRUCTION]
[^1]: In the paper we call these elements _data transfer protocol