Topic of problem

Sometimes the internet suddenly does not work. With isdn-tools like
isdnctrl, ifconfig or imon it shows that i am connected with the
provider. But i can't open any Internetpage or ping any PC in the
Internet.

Logfiles

With the maximum logging it says:
Oct 31 10:17:04 superbyte kernel: NETDEV WATCHDOG: ippp0: transmit timed out
Oct 31 10:17:04 superbyte kernel: isdn_tx_timeout dev ippp0 dialstate 0
Oct 31 10:17:04 superbyte kernel: ippp0: all channels busy - requeuing!
Oct 31 10:17:44 superbyte kernel: NETDEV WATCHDOG: ippp0: transmit timed out

The message repeats every 40 seconds, until i reconnect to the internet
with isdnctrl hangup and dial.

Hardware

I use PCI Fritz Card v1.0
00:08.0 Network controller: AVM Audiovisuelles MKTG &
	Computer System GmbH A1 ISDN [Fritz] (rev 02)
Interrupts:
  5:    6762773          XT-PIC  HiSax

Kernel

Linux version 2.4.22-mh1 (root@superbyte) (gcc version 2.95.4)

Solution:

The Isdn Driver is losing interrupts. Try to change the IDE Cable or
other IDE Devices.
In my case it was that the Kernel did not support IDE AMD/Nvidia.
Compiling it in helped and in addition DMA worked afterwards (but
even without DMA the Problem did not appear again)