Re: ADSL Router - PPP Half Bridge mode background info & Help!
From: Coenraad Loubser (c10u_at_ananzi.co.za)
Date: 04/19/05
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Date: Tue, 19 Apr 2005 22:41:08 +0200
Horst Knobloch wrote:
> Coenraad Loubser <c10u@ananzi.co.za> wrote:
>
>
>>I've got this Planet 3000 something ADSL Router. Now I've got it set up
>>to connect to my ISP with a username and password, and doing NAT (it
>>does DHCP too by default)
>
> ...
>
>>SO i've seen this bridge/half bridge/something mode... where the linux
>>server gets to do the PPPoE and gets the WAN IP on a linux interface.
>
> ...>
>
>>I've tried to set this up, by setting various Bridge and Half Bridge
>>settings and protocols on the modem,
>
>
> Make sure that your bridged WAN interface uses the same
> PVC (VPI/VCI) as the PPPoE interface. Check that you
> also use the proper encapsulation for this interface
> (either LLC bridged/Eth. without FCS, LLC bridged/Eth.
> with FCS or VC multiplexing). It should be the same as
> for the PPPoE interface. However I don't know the
> configuration screens of your modem, so things might be
> named differently.
Aha! Now I didnt notice these settings anywhere, I dont recall - if I
had I would set them the same though.. I think this is where I failed!
Well, currently the modem connects perfectly and I forward all LAN
(192.168.0.x) traffic to it (10.0.0.2), as well as do some port
forwarding via iptables. (which it forwards to the linux box) - the main
thing I want to eliminate!
I downloaded this standalone pppoe dialler, but it just terminated
saying that it received no packets ("beacon" or whatever packets from
the isp, I suppose that the modem shouldve passed on if it was properly
configured). The built-in one that came with Suse pretty much did the same.
Could this also happen because I had one of the settings you mentioned
on the linux side wrong?
>
> If you don't know the right enacpsulation you could find
> out by try-and-error. However for this you would need
> to have the Linux pppoe stuff already set up.
>
>
> ...
>
>>Does the modem get an IP in a setup like this?
>
>
> Not necessary for bridging, however the bridge
> might need one so that you can access its
> configuration.
True..
>
>
>
>>Does all the traffic get
>>sent to the modem purely based on its MAC address?
>
>
> Yes, the bridge forwards traffic by analyzing
> MAC addresses from the ethernet frame.
>
>
>
>>What is DMZ? Is it a better option? Will it accomplish the same?
>
>
> The DMZ is of no need for your (bridge) setup.
>
>
> Ciao, Horst
Thanks man!
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