PPPoE over Ethernet over L2TP

Posted on 2001-07-30
Last Modified: 2008-01-09
Hi all,

Is the following configuration can work ?
1. End user with PPPoE clietn and Ethernet connection to HUb
2. Multiple PPPoE session connected to a Router via a shared Ethernet
3. Router connected to Remote BRAS via a IP Network (either a multi-hop network or IP VPN/L2TP)

Question by:tomyu99
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LVL 63

Expert Comment

ID: 6334529
I don't see any problem, but it might depend on the router and / or the PPoet implementation.
I have 2 computers , both using PPoet connected to a dumb hub, connected to my DSL modem/router.

I hope this helps !

Author Comment

ID: 6334650
Hi Sysexpert,

Many thanks for your reply, but the things that i am not sure is the connection from the router to the BRAS.
The normal broadband implementation is a DSL router then a PVC all the way to the BRAS. i.e. it is a point to point layer two connection between the BRAS and the router.
What I want to know is whether a IP routed network, or more precisely... a IP/VPN L2TP tunnel will serve instead of the ATM layer 2 network.


LVL 51

Expert Comment

ID: 6334784
does this mean that each PPPoE has its own endpoint on BRAS?
By which side is the PPPoE initiated, PC or BRAS?
Could you please describe a bit more detailed the BRAS side.
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Author Comment

ID: 6335042
Hi Ahoffmann,

Thanks for the reply. Yes, each PPPoE  has its own endpoint on BRAS. The PPPoE session is initiated from the PC side just like the normal PPPoE/DSL connection.

Actually, what I would like to confirm is whether it is possible to build a broadband network by a IP/VPN instead of the normal ATM layer 2 network.


LVL 51

Accepted Solution

ahoffmann earned 300 total points
ID: 6335605
l2tpd just supports multiple dial-in connections, but what you need is multiple dial-out connections.
There is a patch for l2tpd 0.63 at  which is a quick hack (using PPPTP), but has been tested succesfully on Linux against 3Com's HiPER ARC and win2k.

Probably you need to patch l2tpd once more, you're welcome ;-)
If you're interested in the history of this patch, have a look at (which in fact does not answer you question)
LVL 27

Expert Comment

by:Asta Cu
ID: 6931966
Hopefully you've already been helped with this question, but thought you'd appreciate knowing this.  It would be great if you could bring this question to a conclusion, awarding the experts above who helped you with points or a comment to them on your status today.

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LVL 51

Expert Comment

ID: 6932207
astaec, and what has this to do with l2tp?

Expert Comment

ID: 6954373
Hi, ahoffmann, astaec pointed this to me and it was explained here:
It was her way of helping bring old and forgotten questions back to the attention of the Asker in the hopes it would be a trigger to close old items, while adding some value for all participants.  The Power Search query she used to get the source listing fell short of expectations.

tomyu99 -->  Please update and finalize this question, as well as the same one you posted in another topic area which is this:

If tommyu99 does not respond in the next 7 days, please guide me with recommendations on closing this question.

Thanks everyone,
Moondancer - EE Moderator

Expert Comment

ID: 6958597
This was finalized today.  If Asker returns with clarification needs on your solution, please respond.
Moondancer - EE Moderator

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