Re: PPP --- TCP bad checksums

John G. Alvord (jalvo@cloud9.net)
Mon, 10 Aug 1998 02:27:03 GMT


On Mon, 10 Aug 1998 11:39:38 +1200, Chris Wedgwood
<chris@cybernet.co.nz> wrote:

>On Sun, Aug 09, 1998 at 02:22:47PM +0100, Peter Broadbery wrote:
>
>> I've noticed that I'm getting a lot of TCP bad checksums when
>> connecting to the net via PPP. These started when I upgraded to
>> 2.1.108 from 2.1.99. I'm running 2.1.115 at the moment, with the
>> same problem. Is this a known problem, or is there any way of
>> tracking this down further, preferably without putting excess
>> strain on my 'phone bill?
>
>Some checksum errors should be expected, but not vast numbers of
>them. Phones line aren't always terrible clean, and all modems suck
>by design, so some data corruption in inevitable.
>
>I would guess earlier kernels didn't report the errors and silently
>dropped the offending frames.
>
>If your getting large number of these, it might be a serial overrun
>in which case you to be able to reproduce these messages fairly
>easily.

There have been many reports that use if VJ compression triggers errors
with some ISP equipment. You might try turning that option off an seeing
what happens.

john alvord
CDs @ http://www.cruzio.com/~billpeet/MusicByCandlelight

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