I have tried several recent distros (FC3, CentOS 4.0 = RHEL 4, etc) which run the new 2.6.x kernel with the new udev stuff and I cannot connet to the Internet through my USB netMOD (dialup ISDN) modem because the necessary device /dev/input/ttyACM0 or /dev/usb/ttyACM0 is missing. Even if I create it manually by executing #mknod /dev/input/ttyACM0 c 166 0 the kppp program reports that it cannot find the modem and when I roboot the system the node (device) is lost.
I must point out that I run CentOS 3.4 = RHEL 3 U4 on another partition with kernel 2.4.21 and I created the device as I mentioned above and the system runs beautifully and I connect to the Internet with no problem.
Anybody knows how to solve this problem?
thanks

Hmm,

the old UDEV chestnut.

I would say that possibly the device is being created as something that you don't expect. However, you seem knowledgable so I don't doubt that you have scoured /dev

I might be wrong here, but i think it is possible to use a 2.6.x kernel and still use devfs. I'm not logged into my linux box, so I can't confirm this. However, I had similar problems with udev not creating proper devices. I would say that UDEV won't create a device if the kernel doesn't support that device. So it may be worth compiling your own kernel with the proper support.

Sorry that these are only general discussion points. Hopefully someone will have direct experience of the hardware you have...

PS, get a new modem!!

Joking.

I just installed Slackware 10.1 and compiled the 2.6.10 kernel, and my pci modem shows up as /dev/ppp, but I haven't yet figured out how to access it in kppp.
Mike.