I'll just explain why I think this problem has nothing to do with the
data I send over PPP.
The problems started when I moved the modem from my old machine to my
new machine. I initially set up the new machine by taring up all the
files on the old machine and untaring them on the new machine. I then
had to adjust a few things, and I may have upgraded a few packages,
but basically it was the same software and the same modem, just with a
different motherboard.
When I realised that CVS was crashing PPP, I tried several different
kernel and pppd versions, and I tried several different ISPs, and I
tried adjusting the clock speed and using only one processor. However,
whatever I tried, PPP nearly always died when I used CVS and hardly
ever died otherwise (with ftp, http, pop3, smtp, bind, ntp, etc).
It may be significant that one occasion when CVS didn't kill PPP was
when I was doing a fast FTP download at the same time.
PPP usually died by just not letting any more packets through; pppd
didn't stop running, and it took rather a long time to respond to
"poff", in fact. But on two occasions there was a proper kernel crash
requiring a reboot.
I have now given up trying to run PPP on my new machine. I've put the
modem back into the old machine and configured it to do IP forwarding.
Now everything works fine again. (I just have to suffer the heat from
two machines under the table instead of one.)
So the same data was going through the modem in the original set-up
(with just the old machine) and in the current set-up (with IP
forwarding) as in the set-up that caused problems (with just the new
machine). And the problem didn't happen with 100% consistency; there
appeared to be a random element.
So I suspect a timing-related kernel bug rather than anything
poisonous in the data.
Edmund
PS. Old machine = anonymous "mainboard" with on-board sound and video
(some SiS chip), Cyric 233 MHz. New machine = Abit BP6, two Celeron
366 (sometimes overclocked).
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