Re: [L2tpd-devel] using l2tpd with portslave

[<je...@au...>]

On Fri, Jan 11, 2002 at 11:14:26AM -0500, Jeff Mcadams wrote:
> >Now I just have to get portslave working and see how well I can get
> >this working with with RequestDSL.  It would be a good idea to ensure
> >that portslave and l2tpd work together and I'm sure it can't be too
> >difficult.  I'll probably write a howto when I've finished.
> 
> I am rather completely unfamiliar with portslave, so I don't know that I
> can be much help in this part...but certainly let us know your success
> and keep involved.

I now have l2tpd working with portslave.  Basically you have to load the
libspr.so plugin that comes with portslave and set the following
environment variables which I set from the script that I started l2tpd
with:
export PORTSLAVELOGNAME=l2tpd
export PORTSLAVE_SESSION=$RANDOM$RANDOM
export PORTSLAVE_START_TIME=`date +%s`

Then you have to configure /etc/portslave/pslave.conf with all the usual
options including to specify all the pseudo terminals.  One thing I'm
not sure is how a pseudo terminal is allocated as /dev/ptyp0 in pty.c
but according to pppd/portslave it's /dev/ttyp0, any ideas?

> Again, I'm totally unfamiliar with portslave, so that doesn't mean much
> to me....I will agree that our conf file sucks swamp water through
> straws though.  I've been pondering other possible formats, haven't
> really had any bright ideas though.

Well to set all ppp options in portslave it has:
all.autoppp     proxyarp %d asyncmap 0 %i: \
                noipx noccp login auth require-pap refuse-chap \
                mtu %t mru %t \
                ms-dns 192.168.1.1 ms-dns 192.168.1.2 \
                plugin /usr/lib/libpsr.so
(which starts pppd in the same way as above when portslave is answering
calls on a serial port).

> >-  Perhaps when l2tp is completely kernel space it would an idea to only
> >   have to configure portslave in userspace and adopt portslave to answer
> >   r l2tp calls.  Although I'm sure some people won't want to use RADIUS
> >   authentication and/or accounting.
> 
> *shrug*  Sounds cool...what little meaning that carried without knowing
> how portslave works.  :)

Well the binary just listens on a serial port and the plugin does most
of the work if autoppp is used.  If the system login method is used then
a bit more has to be done by the portslave binary.

-- 
Jeremy Lunn
Melbourne, Australia
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