Re: [DNA] A comment on draft-pentland-dna-protocol3-00.txt

["Tero Kauppinen (JO/LMF)" <tero.kauppinen@ericsson.com>]

Tero Kauppinen (JO/LMF) wrote:
> Brett Pentland wrote:
> 
>> Hi Tero,
>>
>> I'm not sure about that one.  If the host has been previously assigned
>> an address using DHCP, then it could easily extract a prefix from that
>> to use as a landmark.  The problem would be how the routers found out
>> about the prefixes.  I guess they have to know about them but I'm not
>> sure how DNA would be supposed to access them.  Would it be reasonable
>> to take them straight from the routing table?  I don't know if that's
>> a good idea.  
> 
> 
> Maybe reasonable from programming point of view but I'm not sure from 
> specification point of view.
> 
> Routers could listen to DHCP messages but I'm sure if that would be a 
> good idea either.

While browsing through the DHCPv6 specification in a hope of learning 
more, I realized that the DHCP advertisement message can also be sent 
directly to the client and thus the router "can't" listen to these 
messages. Not that it was a good idea in the first place anyway.

I'm not even sure if this issue is worth putting effort on, because I 
think it's once again one of those corner cases where the network has 
not been configured in an optimal way (Erik's mail) but still an 
optimization mechanism (DNA) would be applied.

/Tero