Re: [DNA] High-level overview of DNA, take 2

[Erik Nordmark <erik.nordmark@sun.com>]

Bernard Aboba wrote:
> \>    Are there other messages that can be sent that could help? Like NS
>>    queries unicast to known routers?
> 
> This is what DNAv4 does (via unicast ARP), because this enables a 
> determination of whether the host has connected to a previously 
> encountered router, without ambiguity.

Does this work if you have a router which
  - uses the same IEEE 802 MAC address on multiple ports (which is 
compliant with the IEEE specifications AFAIK)
  - also does NAT so that the router's IP address on multiple ports is 
10.0.0.1

In that case you'd get an ARP response even though the host had moved to 
a different link.

Because IPv6 has link-local addresses the corresponding situation can be 
quite common even though there is no NAT.

    Erik