Re: [Sip] draft-jennings-sip-hashcash-01

Sigh.... probably. Its been on my todo list forever, and its one of 
these things where the cure may be worse than the disease. But perhaps 
others have a better idea how to fix it than I did. That solution was 
discussed here:

http://www.jdrosen.net/papers/draft-rosenberg-sip-unify-00.txt

-Jonathan R.

Francois Audet wrote:

> As a separate note, shouldn't we try to solve the HERFP problem?
> 
> 
>  > -----Original Message-----
>  > From: sip-bounces@ietf.org [mailto:sip-bounces@ietf.org] On
>  > Behalf Of Cullen Jennings
>  > Sent: Wednesday, March 02, 2005 12:16
>  > To: Jonathan Rosenberg
>  > Cc: sip@ietf.org
>  > Subject: Re: [Sip] draft-jennings-sip-hashcash-01
>  >
>  >
>  > On 3/2/05 2:15 AM, "Jonathan Rosenberg" <jdrosen@cisco.com> wrote:
>  >
>  > > 1. The mechanism interacts badly with forking at the moment. One
>  > > problem is HERFP. If I have a mix of endpoints, some of
>  > which support
>  > > this (and thus send a 419), and others that don't (and thus
>  > ring the
>  > > phone), then you'll end up always completing the call on
>  > the endpoints
>  > > that don't support the extension.
>  >
>  > Good point. I think will mention this in the draft but
>  > clearly I won't attempt to solve the well studied HERFP
>  > problem. As a separate issues, some day the WG should discuss
>  > the limitations of the "If it hurts don't do it" solution to
>  > the HERFP problem.
>  >
>  > >
>  > > 2. THe mechanism doesn't provide a way for a proxy to aggregate
>  > > multiple Puzzle headers from forked branches. It needs to
>  > do something
>  > > like WWW-Authenticate where a proxy collects these from the various
>  > > 419 and places all of them in the 419 forwarded upstream. That will
>  > > also require something akin to realm, that allows a
>  > UA/proxy to pull
>  > > out its own puzzle.
>  >
>  > Oops. Excellent point. Thanks, will fix this.
>  >
>  >
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>  >
> 

-- 
Jonathan D. Rosenberg, Ph.D.                   600 Lanidex Plaza
Director, Service Provider VoIP Architecture   Parsippany, NJ 07054-2711
Cisco Systems
jdrosen@cisco.com                              FAX:   (973) 952-5050
http://www.jdrosen.net                         PHONE: (973) 952-5000
http://www.cisco.com

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