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Re: PPP fix for Sprint wireless network


On Fri, 2005-01-14 at 07:29 -0800, Matt Jerdonek wrote:
> Hi Andrew,
> 
> No, I hadn't seen that patch before.  Thanks for
> pointing it out to me.
> 
> The eCos PPP code is correct as it is today as I
> interpret RFC 1662.  The Sprint network is definitely
> where the problem is.  However, I didn't pursue
> getting Sprint to fix the bug, because I didn't think
> I'd be able to get a timely resolution.
> 
> When I was investigating this issue, I found that MS
> Windows PCs are able to connect into Sprint without an
> issue.  After analyzing the traces, I found that
> Windows always sends the leading flag while eCos does
> not.  After changing eCos, I was able to connect.  
> 
> I don't think we'd introduce any issues by sending
> back-to-back flags.  According to RFC 1662:
> "Two consecutive Flag Sequences constitute an empty
> frame, which is silently discarded, and not counted as
> an FCS error."  (Section 3.1)
> 
> In any case, I won't be upset if you choose to not
> commit this patch.  I was just trying to save someone
> else the time it took me to figure this out.

I would think it acceptable to have this behaviour if the
patch included some CDL to enable it (and it was off by default)

> 
> -- Matt
> 
> --- Andrew Lunn <andrew@lunn.ch> wrote:
> > 
> > Hi Matt
> > 
> > Have you seen:
> > 
> >
> http://sources.redhat.com/ml/ecos-patches/2004-06/msg00029.html
> > 
> > A patch similar to your has been rejected before.
> > Before accepting
> > this i would like an greater understanding what is
> > going on. Is sprint
> > deliberately breaking the RFC, is it just a bug in
> > Sprint's
> > implementation? Or has there been a newer RFC which
> > makes this flag a
> > requirement?
> > 
> >         Thanks
> >                 Andrew  
> > 
> 
> 
> 
> 		
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