Re: [DNA-BOF] Potential Workplan for comment

[Greg Daley <greg.daley@eng.monash.edu.au>]

Hi Bernard,

Bernard Aboba wrote:
[part cut]
>>There are complicating factors regarding the
>>uniqueness of the router's address, but in
>>most cases, it should be possible to detect a
>>change of router without DHC operation.
> 
> 
> Do you mean the router's IP address uniqueness?  The solution to that is
> to also check the router's MAC address, no?

The issue is with non-global scope addresses,
particularly link-local addresses.
Unfortunately, this is not possible since the
Link-Local addresses are often derived from
MAC addresses in IPv6.

The main issue is hardware NICs on a single device
which share the same MAC address across several
interfaces.   While this is not a very common
scenario, it has happened in the past, ans may
also be when changing virtual-link instances
such as moving between VLANs connected to a one-arm
router.

If another globally unique identifier is available
(for example a global prefix) this can be used to
disambiguate things.

If the issue is still cloudy and DHC is available,
I am sure that it will be used.

Greg