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PPTP Client
Debian MPPE HOWTO, patch your own kernel
by James Cameron 6th December 2005
News: MPPE in Linux 2.6.12-rc4-mm2 |
Thanks to Matt Domsch, Frank Cusack, and Brice Goglin, an MPPE patch
using in-kernel crypto functions has been accepted
into the Linux kernel 2.6.12-rc4-mm2 by Andrew Morton, for review and
testing.
The development team welcomes test reports. If you'd like to test
this kernel on a system that you can afford to lose data from, grab
the 2.6.11 source tar.bz2, apply the 2.6.12-rc4 patch, then the
2.6.12-rc4-mm2 patch. You can find each of these on kernel.org.
If you'd like to test just the patch, then Matt's version of it (less
the Kconfig changed by Brice) is available here on our project site;
linux-2.6.10-rc1-ppp_mppe.patch
with signature.
|
2005-05-16 | |
These are instructions for installing MPPE support on Debian GNU/Linux,
with a kernel patched and built from sources.
You do not need to do this for kernel 2.6.15 and later, since MPPE
support is already present.
Instructions
- prepare the system for kernel package building:
# apt-get install gcc bin86 libc6-dev bzip2 kernel-package kernel-patch-mppe
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- install, unpack and clean a kernel source package:
# apt-get install kernel-source-2.6.11.7
# cd /usr/src
# tar xfj kernel-source-2.6.11.7.tar.bz2
# cd kernel-source-2.6.11.7
# make-kpkg clean
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Note: for these instructions we used a kernel-source package built from
2.6.11.7 kernel sources from kernel.org, even though the latest
kernel-source package from Debian Sarge is 2.6.8, and on Debian Sid is
2.6.11. It is up to you to choose an appropriate kernel version, and
so far in the 2.6 series we've found every version worked.
2005-04-11 | |
- adopt the currently installed .config file:
# cp /boot/config-`uname --kernel-release` ./.config
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Note: you may want to substitute a configuration file from a previous
version, or obtain the Debian configuration file by either installing
or unpacking the source of the kernel-image-2.6.11.7 package.
Note: if you are using an already customised configuration file,
ensure that the configuration builds PPP support as modules. That
means CONFIG_PPP=m in .config. The default Debian
configuration file already does this. We've found that static
compilation results in pppd being unable to load MPPE.
- build the kernel package:
# cd /usr/src/kernel-source-2.6.11.7
# make-kpkg \
--added-patches mppe \
--append-to-version -mppe \
--config oldconfig \
--initrd \
kernel_image
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Note: if the kernel version you are building for is 2.6.11.x and the
kernel-patch-mppe package has not yet been fixed, you will need to
edit the file /usr/src/kernel-patches/all/apply/mppe to include the
kernel version number. kernel-patch-mppe 2.4.2+20040216-4 or earlier
is affected, see Debian Bug report #301918.
2005-03-29 | |
Note: if you are tracking Debian woody, you may wish to remove
--initrd.
When you are prompted for the CONFIG_PPP_MPPE option, type m
and press Enter:
PPP MPPE compression (encryption) (PPP_MPPE) [N/m/?] (NEW) m
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Note: you may be prompted for other options if you chose a
.config file that is older than the kernel you are
building. Popular belief says you hit Enter on them.
Note: two people found that they needed to export
PATCH_THE_KERNEL=AUTO before they ran make-kpkg,
otherwise the kernel-patch-mppe was not applied ... but we've
not figured out why. We've tested it many times without it. Perhaps
they had package lag. If you know why this happens, please let us
know.
2005-12-13 | |
Note: the make-kpkg can take a long time, it took 49 minutes
on a 750MHz Pentium III processor with 196Mb. If you have other
computers available, you can reduce this time.
- install the kernel package:
# dpkg --install /usr/src/kernel-image-2.6.11.7-mppe_10.00.Custom_all.deb
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- reboot, then test:
# modprobe ppp-compress-18 && echo success
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If this works, "success" will be displayed. If you are on a console
or watching syslog, you may see:
ppp_mppe: module license 'BSD without advertisement clause' taints kernel.
PPP MPPE Compression module registered
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These messages do not stop it from working.
The procedure for other kernel versions is identical, thanks to
Debian's kernel packaging package. Adjust the commands above for
the version you are choosing to use.
Continue
You have now installed MPPE support. Return to the Installation step in the main
HOWTO.
If you have comments on this document, please send them to the author
at quozl at laptop.org. But if you need help, use the mailing list so that we can share the
load.
Date | Change |
2006-01-04 |
Linux 2.6.15 release includes MPPE.
|
2005-12-06 |
Reverified with Debian Sarge using kernel 2.6.8. No effective changes.
|
2005-04-11 |
Rework for kernel 2.6.11.7, and add note that we know Debian hasn't
got that version yet.
|
2005-03-29 |
Rework for kernel 2.6.11.5, and add warning about apply script
failure. Lay out make-kpkg command more clearly, thanks to David de
Hoog.
|
2004-10-28 |
Rework for kernel 2.6.8.
|
2004-07-02 |
Eliminate the need to edit the .config file, by use of --config flag
to make-kpkg, reported by John Pearson. Revise for kernel 2.6.6.
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2004-04-24 |
Revise for new Debian kernel-patch-mppe package and kernel 2.6.5,
though the instructions are still valid for kernel 2.4.x. We now give
our blessing to kernel-patch-mppe. Thanks Debian!
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2004-02-16 |
Revise for new source package and kernel 2.6.2.
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2003-12-31 |
Add `uname -r` to copy of config file, add missing kernel_image
target, reported by David Powell.
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2003-12-30 |
Major rewrite.
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