[ih] Fwd: early networking: "the solution"

[Greg Skinner]

trying to forward for Barbara

Begin forwarded message:

> From: Barbara Denny <b_a_denny at yahoo.com>
> Date: April 22, 2024 at 9:11:41 AM PDT
> To: Greg Skinner <gregskinner0 at icloud.com>
> Subject: Fw: [ih] early networking: "the solution"
> 
> 
> Could you send this?  Back to the having trouble state.
> 
> barbara
> 
> ----- Forwarded Message -----
> From: Barbara Denny <b_a_denny at yahoo.com>
> To: internet-history at elists.isoc.org <internet-history at elists.isoc.org>
> Sent: Monday, April 22, 2024 at 09:05:05 AM PDT
> Subject: Re: [ih] early networking: "the solution"
> 
> Yeah!!! My last message didn't get blocked so trying this one again.
> 
> I have vague recollections the Internet checksum pointed out a bug in the SINCGARs applique prototype during development.  We were  getting packets that had IP checksum errors  yet had passed all the lower layer checks in the radio portion.  That wasn't supposed to happen.
> 
> barbara
> 
> On Monday, April 22, 2024 at 06:44:12 AM PDT, Andrew G. Malis via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> 
> Vint,
> 
> A memory error caused the upper bit of a routing update sequence number to
> flip, making the sequence number "greater than" the previously circulating
> sequence number by exactly half the sequence number space. Routing updates
> half-way through the sequence space kept chasing each other. We fixed it by
> instituting a window on the sequence space so that only updates "greater
> than" the previous update but within the window were accepted.
> 
> Cheers,
> Andy