I think this sort of detailed analysis goes beyond what we can talk
about without a more detailed description of the deployment scenarios.
For example, I can imagine doing the address assignment with PANA in
a way that uses static QoS and filters on an address pool from which
all temporary address assignments are made. In that case, the PANA
sequence might be:
Temp address assignment
Authentication
Service resource assignment
with no impact on the BRAS state maintenance, and a doubling of
impact on the DHCP server (which might be in the BRAS).
But I'm speculating wildly here without explicit text to discuss. It
might not even be necessary to use temporary address assignment if
address assignment can take place prior to authentication, with
denial of access and/or revocation if authentication fails.
- Ralph
On Oct 24, 2007, at Oct 24, 2007,4:24 PM, Bill Welch wrote:
Alper,
It's just a matter of resource management and managing state on the
BRAS/BNG.
With PPPoE you have the following steps:
Authentication
Resource assignment (Address, QoS, filters)
With PANA you have the following:
Temp resource assignment (Address, QoS, filters)
Authentication
Removal of temp resources (Address, QoS, filters)
Service resource assignment (Address, QoS, filters)
The Addresses, Qos and filters will not be the same for temp resource
assignment and Service resource assignment.
Every login is four step process vs. a two step process and you
have to
manage some type of token or identifier between the authentication and
service resource assignment.
Best regards,
Bill Welch
-----Original Message-----
From: Alper Yegin [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 23, 2007 9:08 PM
To: [EMAIL PROTECTED]; Bill Welch
Cc: 'Internet Area'
Subject: RE: [Int-area] DCHP-based authentication for DSL?
I think we need to understand this a bit better, as now we are talking
about
implementation optimizations.
The fact that the BRAS/IP Edge equipment in this case do not have
to "distribute" a full subscriber IP state in the BRAS until the
subscriber is okay, is a big advantage to the subscriber bring up
rate.
How is the situation different if you were using PANA?
Having a solution that assigns a temporary address or uses a link
local
address complicates the implementation and does not mirror the
existing
PPPoE solution.
Can you please expand on the complication part? Please note that
the IP
address configured prior to subscriber authentication is not the
"service IP
address".
Also, even with DHCPv6, the client is already configured with a
link-local
IPv6 address prior to sending the very first DHCPv6 message.
Alper
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