On Wed, 23 Aug 2006, Syam Madanapalli wrote:
Hi,
On 8/23/06, Ole Troan <[EMAIL PROTECTED]> wrote:
I don't understand the rationale for this work either.
the first PD proposal (by Brian Haberman) was indeed based on using
ICMP as transport. separate message types instead of
piggy-backing on RS/RA though. as we continued to develop that
mechanism we realised that we were pretty much reinventing the DHCP
protocol machine. that realisation led to specifying it as an DHCP
option instead of as a new protocol.
Currently DHCP mechanism works only between routers whereas this
new mechanism works for end hosts. This draft just introduces a flag
in Prefix Information Flag (PIO) to indicate that the prefix is unique for
the device. And another flag in RS to inform the routers that the host is
looking for a unique prefix.
Currently we use RS/RA to discover the prefixes available on the link
(shared prefixes), I think it is natural to extend this for hosts to get
unique
prefixes.
Also, the subnet model that NetLMM WG wants to choose is to have
a unique prefix for each MN. These extensions for RS/RA allows
NetLMM hosts to be able to get unique prefixes in a better compared
to current RS/RA messages.
a technical comment on your proposal; how do you plan to support
shared links with multiple requesting routers? RAs are typically
multicast.
Typically RAs are sent in unicast in response to an RS. When the router
receives an RS with the prefix delegation request flag, the router must
send an unicast RA.
I did not see any implementation until now, that sending RAs in unicast in
response to an RS. The specification allows unicast RAs, but it less
common....
Regards,
Janos Mohacsi
Network Engineer, Research Associate, Head of Network Planning
NIIF/HUNGARNET, HUNGARY
Key 00F9AF98: 8645 1312 D249 471B DBAE 21A2 9F52 0D1F 00F9 AF98
-Syam
/ot
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