Custom kernel is no longer needed!

I started a new approach to the mppe kernelmodule. You have to install the stock redhat kernel with the same version, then you install the kernel-mppe RPM.
It supplies ppp_mppe.o and a patched ppp_generic.o
You can also use it for custom kernels, but make sure the version is the same!
If you want to build the modules yourself, go to the Add-ons section and download kernelmod. After unpacking and reading the README, you're all set to go.