Help: Connecting Linksys WRT54GL Router to ADSL Modem

[Sarc]

Hi

I have a Linksys WRT54GL (running latest DD-WRT beta) and an ADSL Modem. I wish to have the Linksys use PPPOE through the modem. The Linksys must do all the routing and be the DHCP server. The modem need not do anything else. I also want to be able to create a PPPOE connection from any computer connected to the Linksys- this is due to having multiple DSL accounts.

Here's what I have tried thusfar:

1. Connected an ethernet cable from the WAN port of the Linksys to a LAN port on the modem. This setup allows the Linksys to create a PPPOE connection. However my computer connected to the Linksys can not create a PPPOE connection, it can only use the existing one made by the Linksys.

2. Connected an ethernet cable from the LAN port of the Linksys to a LAN port on the modem. This setup does not allow the Linksys to create a PPPOE connection. However a computer connected to the Linksys can create a PPPOE connection.

Can somebody help me? I will appreciate it immensely.

Thank you
Anna

[Anthro]

Hi Anna, you fail to mention the brand of the DSL modem - I would start there..
Need to set that to Half routed / bridge mode first - and then the WRT54 as PPOE.
WAN>LAN port of DSL.

Voila
-Anthro

[Pada]

Unfortunately the DD-WRT firmware doesn't support PPPoE Relaying natively. You might be able to find a PPPoE-Relaying mod. Otherwise, you'll have to do a nasty cable trick to get the half-bridge going Or if you know what you're doing you can probably setup a bridge connection between your LAN ports & WAN port on the Linksys.

That trick would go like follow:
Instead of hooking up the DSL modem to the Linksys' WAN port, you would connect the Linksys' WAN port to its own LAN port.
Then connect a second LAN port on the Linksys to the DSL modem.

With regards to #2:
I'm not sure if you can set the interface that the PPPoE connection would use via the DD-WRT web interface. From the command-line you can AND HAVE to set the interface (eg. eth0). I think you should be able to get the PPPoE connection going via the command-line.
If you don't know the command, check out Gatecrasher's DD-WRT script for splitting traffic on routers running DD-WRT firmware.

[Sarc]

Hi Anna, you fail to mention the brand of the DSL modem - I would start there..
Need to set that to Half routed / bridge mode first - and then the WRT54 as PPOE.
WAN>LAN port of DSL.

Voila
-Anthro

The ADSL modem is a TELKOM Mega 100WR. I have tried your method but it only allows the Linksys to create the PPPOE, not the computers connected to the Linksys.

Thanks Anthro for the reply though.

[Sarc]

Hi Pada

With regards to the PPPOE relaying mod for DD-WRT, this is what I found with GOOGLE:

DD-WRT PPPoE Passthrough (on WRT54G)

For a PPPoE Passthrough on DD-WRT, enable jffs and do the following steps on a *nix-based system

cd /tmp;
wget http://kamikaze.openwrt.org/8.09.1/b...-1_mipsel.ipk;
tar zxf rp-pppoe-relay_3.10-1_mipsel.ipk;
tar zxf data.tar.gz;
scp usr/sbin/pppoe-relay root@:/tmp/

Start the relay agent on the router

/tmp/pppoe-relay -S vlan1 -C br0

Now you can start your pppoe client on your notebook.

Tested with a WRT54G and DD-WRT v23 !

OR

Go to http://routerip/Diagnostics.asp
(Administration, Commands )

Copy and Paste
Code:
killall pppoe-relay
wget http://www.linfati.cl/forget/pppoe-relay -O /tmp/pppoe-relay
chmod 755 /tmp/pppoe-relay
/tmp/pppoe-relay -S vlan1 -C br0

Click ON Save Firewall

Tested on Wrt54gs 2.1, ddwrt 24 presp2
pppoe-relay compiled from svn


Is this what you are referring to?

Via the VLAN's menu within DD-WRT, I have assigned the WAN and LAN ports to the same bridge. That cable trick you mention is nasty indeed, and would be very confusing to manage- perhaps connecting WAN of Linksys to LAN of modem, as well as another cable connecting a LAN of Linksys to a LAN of modem would do the trick, but this too is not a good solution.

Ideally I would like to have the Linksys connected to the modem via its WAN port, as the traffic would be covered by the built-in firewall.

Thanks for the very advanced insight and support you have provided.