RE: New Version Notification for draft-maglione-radext-ipv6-acct-extensions-00

[Maglione Roberta <roberta.maglione@telecomitalia.it>]

Hi Alan,

>  I suppose you could distinguish traffic IPv4/v6 for a session by
> simply sending two different accounting streams.  e.g. one with an IPv4
> address, and another with an IPv6 address.  The Acct-Multi-Session-Id
> attribute would be good for this.

I'm not sure we could use the Acct-Multi-Session-Id for this purpose because according to the definition in RFC 2866, Acct-Multi-Session-Id links together multiple sessions with different Acct-Session-Id

"5.11  This attribute is a unique Accounting ID to make it easy to link
      together multiple related sessions in a log file.  Each session
      linked together would have a unique Acct-Session-Id but the same
      Acct-Multi-Session-Id."

While in the described scenario there is a single session that carries multiple traffic flows: IPv4 and IPv6.

In addition I see an operational issue in terms of efficiency in doubling the number of Accounting streams, because we usually have around 20-30 thousand active subscribers in a single NAS thus  sending the Accounting stream twice may affect the performance of the NAS.

Regards,
Roberta

-----Original Message-----
From: Alan DeKok [mailto:aland@deployingradius.com]
Sent: Friday, February 26, 2010 10:30 AM
To: Avi Lior
Cc: Maglione Roberta; radiusext@ops.ietf.org; Alan Kavanagh; Suresh Krishnan; Varga Balázs
Subject: Re: New Version Notification for draft-maglione-radext-ipv6-acct-extensions-00

Avi Lior wrote:
> Wouldn't the IP address contained in the IP session be sufficient to create the context for the accounting message?

  I suppose you could distinguish traffic IPv4/v6 for a session by
simply sending two different accounting streams.  e.g. one with an IPv4
address, and another with an IPv6 address.  The Acct-Multi-Session-Id
attribute would be good for this.

  e.g. for IPv4, send:

Framed-IP-Address = ...
Acct-Session-Id = 1234
Acct-Multi-Session-Id = foo
(octets / packet counters)

  For IPv6, send:

Framed-IPv6-Address = ... (presuming draft-lourdelet is standardized)
Acct-Session-Id = 5678
Acct-Multi-Session-Id = foo
(octets / packet counters)

  IIRC, this functionality is already used to track different kinds of
user traffic in certain environments.  It's not widely supported in the
ISP / dial-up environment, but it shouldn't be hard to add.

  Leveraging the existing functionality of RADIUS would mean that this
document is unnecessary.

  Alan DeKok.

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