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PPPOE pass through Cisco Routers

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cmontero at bme

Mar 20, 2012, 5:07 AM

Post #1 of 5 (819 views)
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PPPOE pass through Cisco Routers

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?

Thanks very much in advance.

Gracias y saludos,

Cipriano Montero

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avayner at cisco

Mar 20, 2012, 5:23 AM

Post #2 of 5 (762 views)
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Re: PPPOE pass through Cisco Routers [In reply to]

Hi,

You most likely need to look into Layer 2 VPN options... Either over
MPLS (EoMPLS/ATOM/VPLS) or over IP using L2TPv3.
Be careful with MTU...

Arie

-----Original Message-----
From: cisco-nsp-bounces [at] puck
[mailto:cisco-nsp-bounces [at] puck] On Behalf Of Cipriano
Montero, Infostock
Sent: Tuesday, March 20, 2012 14:07
To: cisco-nsp [at] puck
Cc: Juan Luis Hoyo Herbello
Subject: [c-nsp] PPPOE pass through Cisco Routers

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?

Thanks very much in advance.

Gracias y saludos,

Cipriano Montero

_______________________________________________
cisco-nsp mailing list cisco-nsp [at] puck
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/

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mike-cisconsplist at tiedyenetworks

Mar 20, 2012, 6:27 AM

Post #3 of 5 (748 views)
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Re: PPPOE pass through Cisco Routers [In reply to]

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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Vinny_Abello at Dell

Mar 20, 2012, 10:34 AM

Post #4 of 5 (746 views)
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Re: PPPOE pass through Cisco Routers [In reply to]

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 [mailto:cisco-nsp-bounces [at] puck] On Behalf Of Mike
Sent: Tuesday, March 20, 2012 9:28 AM
To: cisco-nsp [at] puck
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-
_______________________________________________
cisco-nsp mailing list cisco-nsp [at] puck
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/

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cmontero at bme

Mar 21, 2012, 1:30 AM

Post #5 of 5 (755 views)
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Re: PPPOE pass through Cisco Routers [In reply to]

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
Infostock Europa de Extremadura, S.A. | www.infostock.es

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-----Mensaje original-----
De: Vinny_Abello [at] Dell [mailto:Vinny_Abello [at] Dell]
Enviado el: martes, 20 de marzo de 2012 18:35
Para: mike-cisconsplist [at] tiedyenetworks; cisco-nsp [at] puck
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 [mailto:cisco-nsp-bounces [at] puck] On Behalf Of Mike
Sent: Tuesday, March 20, 2012 9:28 AM
To: cisco-nsp [at] puck
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-
_______________________________________________
cisco-nsp mailing list cisco-nsp [at] puck https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/

_______________________________________________
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