PCMCIA Wireless Modem Transmit Issues

[klopfest]

Here is a real poser that I need help with.

I have a Sierra Air Card wireless Modem with T-Mobile. Using the Linux drivers, and instructions from the "unsupported" web site at www.sierrawireless.com, I have successfully gotten the card up and running, and have been using it for 3+ months.

About two weeks ago, I noticed that the card will hang with a solid yellow light on the side, and all network communication ceases. This only happens when sending "large" files (>50 kB). I can download as much as I want, and send emails (without "large" attachments). To reset, I can to kill the pppd process, and restart the pcmcia service. I can then connect again without any problems.

I have completed similar actions using the Windows XP version with the same card and same laptop with out any errors.

So....my question(s) are:

1) Has anyone heard of this, and do they have a fix?
2) What is the best way to debug this? /var/log/messages and dmesg show nothing of note

Any help?

Thanks

[Jman]

pppd does have a debug option, not sure how to enable it in the startup scripts.

However, you will have to change the syslog config to get it in a file. Add this to /etc/syslog.conf:

daemon.=debug /var/log/debug

This should put pppd debug messages in /var/log/debug. Then restart syslog.