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Re: ppp: frame with bad fcs



"...something munging bytes on the way through," is what I assume.  

I can load the same pages on my Win95 laptop with no problem with the same ISP, so it appears to be Linux somehow that is doing this.

Last night I recompiled the kernel (a potato system, I had been using the default 2.2.14 kernel), and this seems to have relieved the problem somewhat -- stuff downloads very slowly from the problem sites, but I don't get the timeouts that I was getting.  No error messages are now evident.

Maybe I need to examine the packets that are getting sent over to me?

> fcs is Frame Check Sequence. PPP over an async link uses HDLC-like framing for each packet. The FCS is used to detect errors in packets which are received. Such an
> error could happen on a link which is not error-corrected. On a link which is error-corrected this probably indicates something is munging bytes on the way through.
> This could happen because of things like software flow-control, which inserts XON/XOFF bytes into the stream to tell the other side to stop sending data. Make sure your
> modem is configured to only do hardware flow control.
> 
> fairfax@pclink.com wrote:
> 
> > I am having trouble recieving files via PPP from certain sites.  I checked the debugging log, and I am repeatedly getting a two-line error message from those sites:
> >
> > kernel: ppp: frame with bad fcs, length = 994
> > kernel: ppp: bad frame, count = 994
> >
> > Can anyone tell me what this means?
> >
> > It seems that my PPP connection receives a bad frame, and keeps requesting that same frame over and over again (I get the same message repeated throughout the log).
> >
> > Thanks,
> >
> > Steve Martin
> 
> --
> Jens B. Jorgensen
> jens.jorgensen@tallan.com
> 
> 


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