TJ wrote:
So, a single example of IPv4 behaving in a suboptimal manner would be enough to declare IPv4 not operational?
For example?
"Heavy reliance on broadcast for a wide range of instances where the traffic is really only destined for a single node" would seem to be rather sub-optimal.
It's not sub-optimal w.r.t. link bandwidth, if the link is a broadcast domain. Moreover, broadcast is no worse than all-node multicast. And, given the CATENET model of the Internet to connect broadcast domains including small number of devices by routers, over which there is no broadcast, that is a sub-optimal operation. In this thread, there is an example of such an operation to have a lot of WiFi base stations with omnidirectional antennas at full power. No protocol can be fool proof against sub-optimal operations. Masataka Ohta