North American Network Operators Group
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Re: Security problem in PPPoE connection

  • From: Florian Weimer
  • Date: Sun Mar 12 14:33:20 2006 
* Peter Dambier:

> I am connected through this one:
>
> Access-Concentrator: DARX41-erx
> AC-Ethernet-Address: 00:90:1a:a0:01:46
> --------------------------------------------------
>
> I guess dtag.de has got some 8 of them. Everybody
> (almost) offering dsl in germany goes through their
> infrastructure. The ip address range 84.167.0.0/16
> seems to be shared by all of them.

But you've got an ATM PVC to them, haven't you?  This is a completely
different setup.

Imagine you haven't got a DSL modem, but just an RJ45 plug in the wall
which leads into a stupid cloud of L2 Ethernet switches, and you still
talk PPPoE to your ISP.  AFAICS, this is the kind of network setup the
OP is talking about.