Honestly, I think it is going to depend on your ISP. For example, Embarq
a few years ago switched their 'Embarq' ISP to using a hybrid DHCP setup:
(Whatever the DSLAM connects to)<--PPPoE-->DSLAM<--DHCP-->Modem<--DHCP->
So when you set the modem to 'Bridge' whatever was behind it was set to
DHCP, not PPPoE. PPPoE no longer worked because the DSLAM took care of
the PPPoE connection, not the modem anymore.
If you were on someone who resold Embarq, then that reseller had to use
PPPoE so that it routed back to the reseller correctly.
Chris
David Walker wrote:
From: Claudio Jeker
The main encapsulation over ADSL is PPPoE or PPPoA only lately, with the
spread of IPTV and VDSL, EFM (Ethernet First Mile) is used by some telcos.
So it totaly depends on what your provider is giving you.
Hi Claudio.
Maybe I didn't explain myself or perhaps I am trying to explain
something that doesn't make sense.
I understand there are differing methods of getting the packets from
the exchange to the premises, etcetera.
Considering the existing popular method of PPPoE is there more than
one way to collect those packets at the first adapter after the modem?
My current scenario:
DSLAM<-----PPPoE----->Modem<-----TCP/IP----->Router
In this case, the relevant adapter on the router gets an IP address
from the modem's DHCP server. All the PPPoE to IP transactions occur
within the modem.
The hostname.if file on the router:
DHCP none none none
The other scenario:
DSLAM<-----PPPoE----->Modem<-----PPPoE----->Router
In this case the relevant adapter on the router recieves PPPoE
encapsulated packets from the modem exactly as they are sent from the
exchange.
The modem does not do any PPPoE to IP conversion.
The hostname.if file on the router merely says "up".
There is also an /etc/hostname.pppoe0 file on the router.
This "other scenario" seems to be the intent of pppoe(4):
This is often used to connect a router via a DSL modem to an access con-
centrator. The pppoe interface does not by itself transmit or receive
frames, but needs an Ethernet interface to do so. This Ethernet inter-
face is connected to the pppoe interface via ifconfig(8). The Ethernet
interface needs to be marked UP, but does not need to have an IP address.
So it is quite different from my "current scenario" - no IP address for a start.
Am I reading all this correctly?
Best wishes.
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