Data transfer slows down

Dear newsgroup,

I installed RedHat 9 on my Dell Inspiron 4100 notebook and get connected 
to the internet with the ppp-daemon. But I have some problems with the 
connection. After a while, especially if I'll download some files via 
ftp or http, the connection slows down and almost no data transfer is 
possible. I tried various providers but the szenario decribed above 
always happens. Does anybody experienced the same or knows a solution?

Here is my system setup:
I used the redhat-config-network program to configure the pppd. 
Additionally I'm using the ppp options 'idle 120', 'lock' and 'debug'. I 
connect to an ISDN line with the ELSA Microlink ISDN Internet modem, an 
AT command set compatible modem, which is connected to /dev/ttyS0. I 
communicate with 115200 baud and RTSCTS flow control. The internet 
browser I use is Mozilla.

Thank you in advance, Thomas Reisinger

-- 
Thomas Reisinger
mailto:[email protected]