Subject: Re: DSL Configuration
From: Peter M. Bagnall (pete@surfaceeffect.com)
Date: Sun Nov 19 2000 - 19:12:56 MST
>I have cable-modem and have it set up as I described
>and it works flawlessly.
>
>Sy Bensky
>
>--- Fernando Corvinos <corvinos@stanford.edu> wrote:
>> I DID IT BUT DID NOT GO. WHEN I AM USING THE
>> CONNECTION UNDER Mac I HAVE TO
>> SETUP TCP/IP LIKE CONECT VIA PPP USING A PPP SERVER.
>> FOR MORE INFORMATION MY ISP IS DEUTSCHE TELEKOM.
As I understand it there are two types of DSL. The one Sy described had a
separate box which acts as a DHCP server and is in fact a bridge router.
The type I suspect Fernando has is a IP over whatever tunnel (probably ATM,
that's the underlying network for my DSL line). The box he has probably
just turns the ATM link into an ethernet interface right through to the
other end where the ATM link is connected into the IP network. So
essentially he's got Ethernet tunnelled over ATM, and then IP over the
Ethernet.
The upshot of all this is the Fernando probably needs PPPOE (Point to Point
Protocol Over Ethernet). You can get such a thing for Linux. As a starting
point you might want to look at (I'm sure there are better resources out
there).
http://www.linuxports.com/howto/ppp/c1612.html
If I understand things right the bridge router version is actually less
than optimal. The one I have uses four IP addresses. One for my machine,
one for the router box itself and since it's on it's own subnet it needs a
network address and a broadcast address too. So it's not too unlikely that
more and more ISPs will start to move to PPPoE. PPPoE only needs one IP
address, the one for the users host I think. Since IPv4 addresses are
getting a bit scarce this could be an issue.
Anyhow, I hope that helps some. I may have got the details a bit off, I'm
not absolutely sure about that so it's worth checking.
One other tip, if you use PPPoE then I think it can get your DNS server
info for you, but I may be wrong there. DHCP definately can do that, my DSL
units DHCP server does.
You may also find it helpful to call your ISP and ask them if you need
PPPoE. Do they explicitly support Linux?
Pete
-- Peter M. Bagnall pete@surfaceeffect.com - http://www.surfaceeffect.com/
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