[Gllug] ADSL modem -- WTF?

[Richard Jones]

On Mon, Jul 19, 2004 at 11:47:41PM +0100, Russell Howe wrote:
> There's something
> called LANE (LAN Emulation) which I guess emulates a broadcast network
> over ATM, but I guess that's overkill for running PPPoE sessions over
> DSL.

I'm pretty certain that LANE is irrelevant nowadays.  As you guessed
it used to be used to support broadcast LANs over ATM (very
inefficiently), but that's not relevant to P-to-P connections.

> There are various AAL<n> things which are ATM Adaptation Layers (?) and
> are numbered. Basically different ways of using ATM signalling, I think.
> Maybe one of those looks sufficiently like ethernet to run PPPoE over?

AAL5 is the only one anyone outside telephone companies ever used.  It
basically allows you to send arbitrary sized packets (with a lot of
overhead).

> Hopefully with some ATM equipment I can switch to receiving PPPoA frames
> on my firewall and lose the MTU issues.

ATM is full of horrors - eg. Q.2931 signalling.  SVCs.  UNI vs. NNI.
Shame really, because the idea behind it (label swapping) is quite
nice.

I'm pretty sure that most ADSL routers that you can buy support the
absolute minimum subset of ATM necessary to encapsulate IP packets
over a point-to-point ADSL link, and nothing further.

Rich.

-- 
Richard Jones. http://www.annexia.org/ http://www.j-london.com/
Merjis Ltd. http://www.merjis.com/ - improving website return on investment
If I have not seen as far as others, it is because I have been
standing in the footprints of giants.  -- from Usenet
-- 
Gllug mailing list  -  Gllug at gllug.org.uk
http://lists.gllug.org.uk/mailman/listinfo/gllug