News: MPPE in Linux 2.6.15-rc1 An MPPE patch has been accepted into Linux kernel 2.6.15-rc1. This will mean the end of having to patch your kernel or build modules. Rejoice. Now what will we do? -- James Cameron 2005-11-12

These are instructions for installing MPPE support on Debian GNU/Linux, using DKMS. This is only necessary for kernel versions below 2.6.15.

1. look to see what kernel-image package you are using:

   # dpkg -S /boot/vmlinuz-`uname -r`

   For example:

   hostname:~# dpkg -S /boot/vmlinuz-`uname -r` kernel-image-2.6.8-2-686: /boot/vmlinuz-2.6.8-2-686

   Note: this works by finding what package on the system owns the kernel file (vmlinuz) corresponding to the version of the currently running kernel (uname -r). It might fail if you are using a custom installed kernel that isn't from the Debian distribution. If this is the case, you cannot continue with these instructions.

2. install the exact kernel-headers package corresponding to the kernel-image package you are using, for example:

   # apt-get install kernel-headers-2.6.8-2-686

   Note: the kernel-headers package may not be available in your chosen package sources, but it is essential. You must either find the right package for your kernel (apt-cache search kernel-headers), or install a new kernel-image package along with it's kernel-headers package.

   We tested by installing kernel-image-2.6.8-2-686 and kernel-headers-2.6.8-2-686 from the Debian Sarge distribution, and then rebooting.

3. add the following to your sources.list file:

   # kernel-ppp-mppe deb http://pptpclient.sourceforge.net/mppe/debian ./ # dkms deb http://linux.dell.com/repo/software/debian sarge dell

4. update the package list:

   # apt-get update

5. install the kernel-ppp-mppe, dkms, patch, make, and gcc packages:

   # apt-get install kernel-ppp-mppe dkms patch make gcc

6. add, build and install the MPPE module using DKMS:

   # dkms add -m kernel_ppp_mppe -v 1.0.2 # dkms build -m kernel_ppp_mppe -v 1.0.2 # dkms install -m kernel_ppp_mppe -v 1.0.2

7. immediately test (no need for reboot):

   # modprobe ppp-compress-18 && echo success

   If this works, "success" will be displayed.

   If you are on a console or watching syslog, you may see:

   PPP MPPE Compression module registered

   This is normal.

You have now installed MPPE support. Return to the Installation step in the main HOWTO.

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