[c-nsp] PPPOE pass through Cisco Routers

[Cipriano Montero, Infostock]

These readings and others focus us to L2TP, because we don't have MPLS deployed. We have read the article in cisco.com "PPPoE Relay", and it seems to be the right solution, but some questions rise up:

.- With two APs behind the router, we need two tunnels in the router, right?
.- Or... unfortunately, we should establish a tunnel per CPE (i.e., per client) behind the APs, so having a big number of tunnels?

Thanks very much.


Gracias y saludos,
Cipriano Montero
Tel: 924 808016 ext 5722.
cmontero at bme.es
Infostock Europa de Extremadura, S.A.  | www.infostock.es

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-----Mensaje original-----
De: Vinny_Abello at Dell.com [mailto:Vinny_Abello at Dell.com] 
Enviado el: martes, 20 de marzo de 2012 18:35
Para: mike-cisconsplist at tiedyenetworks.com; cisco-nsp at puck.nether.net
Asunto: Re: [c-nsp] PPPOE pass through Cisco Routers

Congruent with your last suggestion, what about using L2TPv3 in a LAC/LNS sort of configuration? It's very easy to setup if you don't already have an MPLS enabled network deployed.

-Vinny

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mike
Sent: Tuesday, March 20, 2012 9:28 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] PPPOE pass through Cisco Routers

On 03/20/2012 05:07 AM, Cipriano Montero, Infostock wrote:
>
>
> As an environment as Wireless ISP, we are trying to deliver PPPOE 
> connections to our clients, in a routed network. So, our first problem 
> is to pass through PPPoE protocol over one or several cisco routers. 
> Could somebody help us with this task?
>

This isn't the cisco answer you are looking for, however....

	PPPoE is a layer 2 protocol, and it (normally) requires that your clients are in the same broadcast domain as your PPPoE termination device (eg: plugged into the same switch for example). So, in a routed network, there won't normally be a layer 2 path here since you've got vlan's and / or routers connecting your network segments.
	
	One choice could be to use a PPPoE relay agent. This would have a router listen on some interface for PPPoE frames and then relay them to another interface where your PPPoE server is residing. This works for 1 hop when you have clients on one interface and the server is on another, but I don't think you want to try extending it beyond 1 hop.

	Another choice - and the one I myself use - is to create a layer 2 vpn. 
I know there are cisco mpls solutions for this which someone else can comment on. I happen to use an opensource package called OpenVPN and it's stable and reliable. Effectively you'd have two boxes - one out in your network facing your wireless customers, and then another near your PPPoE server, and there would be a tunnel built on UDP that the traffic would pass thru. MTU isn't really a problem although if you have jumbo frame support internally it would reduce your packet fragmentation.

Good luck.

Mike-
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