Hello all,
This is an announcement for a new beta release of a decently scalable L2TP
stack for Linux. It is based off of the Babylon PPP stack created by
SpellCaster back in the '98-'00 timeframe. Right now there are lots of
rough edges (especially in terms of documentation), but it works well enough
for many purposes.
The main difference between the Babylon PPP stack and pppd is that the
Babylon code uses a single process for controlling all PPP sessions
established throughout the system, which uses significantly less memory
and processing power per connection. Practically speaking, a mid range
system can terminate thousands of sessions without breaking a sweat.
Features
- entirely GPLed
- can terminate thousands of sessions
- includes kernel mode multihop for L2TP
- can act as an LAC or LNS
- has gigawords accounting for sessions
- includes Radius client support
- already in use to terminate real L2TP traffic for 2 ISPs.
- works on x86/x86-64. Not expected to work on architectures where
unaligned memory accesses are problematic.
Non-Features
- Uses its own kernel mode PPP stack for L2TP and PPPoE. The
exact direction for this is open to discussions, but will require
lots of work to address the scalability issues.
- PPPoE support is not well integrated at present. It works for
dial out (kernel mode via drivers/pppoe/pppoed and kernel/bab_pppoe.o)
or PPPoE->L2TP conversion (userspace), but not incoming calls as-is.
- device nodes are still a work in progress
- packaging needs improvement
- the kernel code is not at all ready for merging as it needs fairly
major cleanup in several areas
The README.l2tp file gives a rough description of what is needed to get
things going on recent 2.6 kernels, but I've only been testing 2.6.22.5
for this release. Questions/comments are appreciated. The source can
be had via git clone http://www.kvack.org/~bcrl/babylon.git/.git . Cheers,
-ben
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