[ale] OT?: PPPoE Topology

[Mills, John M.]

ALErs-
 
I came late on this thread, but it's perfectly timed for me! This evening
I'm trying to straighten out a friend's new BellSouth DSL setup and I had
planned to put a simple Linksys DSL router behind the Westell modem,
thinking the modem expected the client (here, my Linksys) to open the PPPoE
link by providing username and password.
 
This note sounds as though the Westell modem usually handles that part of
the startup, so why involve the router at all? Can't it just apply as a
generic DHCP client and get what it needs? (Actually I thought I'd done that
other times w/ BellSouth subscribers.)

Great to have the user manual, by the way!
 
Thanks for any comments.
 
 - Mills

________________________________

From: Ian Philpot [mailto:ian.philpot at gmail.com] 
Sent: Wednesday, June 15, 2005 2:46 PM
To: ale at ale.org
Subject: RE: [ale] OT?: PPPoE Topology


First thank you for replying and the link looks like it will be helpful. I
will review that later tonight.

Secondly that topology is pretty dead on. 
Firewall(Creating PPPoE connection) > Westell Modem > Internet

As for the modem creating a PPPoE connection, this is not something I have
set up (again I will review the link/pdf for more info). To my knowledge it
sits on the Physical layer and handles transmission. My firewall creates a
PPPoE connection (Layer 2?) to bellsouth branch office. Please correct me if
I am wrong.



-- 
/ip | http://www.faqs.org/rfcs/rfc1739.html



So you have the following setup?

Soho firewall-->DSL Modem-->Internet

?  We'll need more information to help.

For example, which modem do you have?  Older DSL modems (Alcatel Speed
Touch series comes to mind) didn't have a built in router, but the

Westell modems that Bellsouth has been using for at least 3 years now
have a built in router.  If you go into the advanced properties of the
modem, you can change the connection mode to Bridged Ethernet, bypassing

the modem's internal PPPOE "client".

http://www.fastaccess.drivers.bellsouth.net/documents/Westell_Guide.pdf 


-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
Philpot, Ian
Sent: Monday, June 13, 2005 10:02 PM

To: ale at ale.org
Subject: [ale] OT?: PPPoE Topology

I have a question that maybe off topic a little. If I'm not in the right
place please point me in the correct direction!


What part does the DSL transceiver(modem) play in the PPPoE protocol
stack to build a session between client(soho firewall) and
server(Bellsouth PPPoE server?)?

Does it get an IP Address? and if so is it the first hop after my

internal gateway or is that the b/o?

Any help is appreciated, links to documentation are welcomed.

--
Ian Philpot

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