Re: ADSL connection qustion

From: Peter Matulis (1_at_1.com)
Date: 12/17/03 

Date: Wed, 17 Dec 2003 12:36:45 -0500

On Thu, 18 Dec 2003 02:28:18 -0000, "Justin"
<yu0123@justin7.freeserve.co.uk> wrote:

>
>"Neil Horman" wrote in message
>
>> As opposed to a dial up service, where you actually need to
>> dial the ISP phone number, the ADSL modem can forward your LAN traffic
>> shortly after power on with little or no intervention from any machines
>> that you place on your network. However, it does not mean staic IP
>> addresses. Usually, ISP's will provide DHCP services from the C.O., or
>> from a DHCP server running on the DSL modem.
>
>I think i had the wrong idea about ADSL connections, from what you said, an
>ADSL connection is unlike a dial up connection, once I power up my ADSL
>modem the connection is made. but I think my ISP requires username/passwd
>authentication before I can actually use the connection,

The principle is the same as dial-up. You always need two things:

(a) account authentication (username/password)
        - this can be achieved via a router
        - or an internet gateway/firewall
(b) configuration of your routing device.
        - If you have a modem that acts as a router then this is what
        gets configured.
        - If you have a host (behind a traditional adsl modem) acting
        as a firewall then this is what gets configured

>I cant get the
>modem to do that obviously, so how I can get the linux router to do that for
>the whole LAN automatically everytime authentication is required? (you
>mentioned pppoe, will that do this job?)

The authentication device (see above) willl provide this feature
through network address translation (NAT, or ip masquerading).

PPPoE itself is a networking protocol only. It is a fairly recent
method in North America (2 years I believe) for communicating to one's
ISP with a broadband modem (xDSL, cable, wireless). See RFC2516 for
details:

http://www.faqs.org/rfcs/rfc2516.html

>and is it possible to use any of
>the LAN computers to authenticate through the router?

Again, only one device authenticates. And it does this once. If you
disconnect then you must authenticate again. This device can then act
as an internet gateway for multiple lan hosts. Of course, these lan
hosts must be configured correctly (in particular, to use the internet
gateway's internal network adapter as a host's default routing
gateway).

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