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Serial port/modem/ppp problem...



I'm having a hard time getting my dial-up connection working with any consistency.  Basically, I get connected and the modem reports about 31kb/s - not unreasonable.  This seems fine for some things, like surfing the net, but when things go badly is when I try to download something that is not just a short burst (like a web page or small web graphics.)  Typically, with a file about 200k, this is what happens (downloading using Netscape/FTP program/that KDE browser/Anything...)
- The download begins.  Very snappy.
- After about 60-80k, the connection falters and poops out.  The download stalls and doesn't start up again no matter how long I wait.
- In the meantime, I can still hit other (non-cached) pages and even see (using kpppload) that the overall connection is working fine.  Just that 'stream' died.
 
Here's what I'm working with...
- RedHat 6.1 (almost fresh - very standard installation, I think)
- USR external FaxModem (not WinModem)
- KDE 1.1.2
- KPPP 1.1.6
 
Here's a kicker...  I can dual boot to Windows on the same computer and it works great.  No hiccups or stalls or anything.
 
I've tried to narrow down the problem by eliminating certain things.  Here's what I've tried:
- About a million things in /etc/ppp/options
- Another modem.  Same problem.
- All sorts of modem init strings.
- Keep looking at ifconfig - The ERRORS tally climbs pretty fast when the hiccups happen!
- Various changes using setserial
 
So this seems to me, like it's got to be a problem with the serial port or modem initialization problem, right?  I'm not within reach of that computer at the moment, but if you think it'd help to have the output of ifconfig or setserial or anything else, please let me know.  I'd LOVE to finally let that rotten Windows partition go and only use Linux at home, but this is stopping me for sure.
 
Thanks very much - sorry this note got so long!
 
-Cj