Subject: Re: m2pa query

From: "Brian F. G. Bidulock" <[email-masked]>
Date: Mon, 13 Aug 2001 12:27:36 -0500

Tom,

What are you getting at here?  A pattern of all zeros "exercises"
the SCTP checksum as much as a pattern of all ones, or a random
repeating pattern for that matter.

Furthermore, if the SCTP checksum goes to 32-bit CRC, it will be
stronger than SS7's 16-bit CRC, and yet even SS7 sends a repeating
pattern during proving.

Was this procedure trying to somehow accomodate some perceived
deficiencies of the Adler-32 checksum?

--brian

Tom George wrote:                                             (Mon, 13 Aug 2001 09:55:38)
> If M2PA sends the same thing over and over (e.g., all zeroes) in the
> Proving Data message, it is not going to provide much exercise for the
> SCTP checksum. 
> 
> [email-masked] wrote:
> > 
> > hi  tom
> >   i have a query regarding proving message
> > 
> > as you said
> > "It is recommended that the Data field contain a number pattern which
> > varies among the Proving Data messages, and that will allow the SCTP
> > checksum to be used to verify the accuracy of transmission."
> > 
> > can you explain it further
> > 
> > regards
> > 
> > manish
> 
> -- 
> * Tom George        972-519-3168         [email-masked]   *
> * PB2-1323       Intranet:  http://www.ssd.usa.alcatel.com/~tgeorge/  *
> * Alcatel USA, Inc.; 1000 Coit Rd, MS PB2-STPA; Plano TX 75075-5813   *
> * I actively disclaim speaking for Alcatel USA, Inc. I do not purport *
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> 
> 
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-- 
Brian F. G. Bidulock
[email-masked]
http://www.openss7.org/

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