I have a Zyxel P660HW-t1 v2 router (which has a DSL port) and a WRT54GL router (which does not) and the exact same situation as in this thread (UPDATE: the connection between both devices is the important part, since I have been able to set the zyxel router to act as bridge by itself quite nicely. I have accessed my internet connection directly through a PC using PPPoE without any problems, the issues arise when I try to connect the WRT54GL router between the zyxel "modem" and my PCs).

I've been trying to use my Zyxel P660 as a modem only:

1. Setup P660 to bridge mode.
2. Changed WRT54GL's IP address to 192.168.2.1 to avoid a conflict on the network.
3. Configured the PPPoE settings as required on WRT54GL.

The thing is that when I connect the Zyxel modem/router on the WRT54GL's internet port the light doesn't turn on. I can confirm that this port has been working ok, so I'm not really sure what's going between the devices. I checked several settings such as IPs, tried disabling DHCP on Zyxel/Linksys, Firewall on both and still nothing. Also, I tried connecting Zyxel directly to a computer in bridge mode and dialed successfully.

I have even posted a question here before, thinking that what I asked there was the only thing I needed to get things done. Unfortunately it wasn't, and the guy that solved his issue didn't give enough details in his post (and is quite unlikely to give more details since he was an anonymous user).

For one, I don't know how to do this part:

connected to the Zyxel through telnet and forced LAN port 1 to be at 100mb as well

I can't find the option that does this on the zyxel router. Not through telnet or the web admin.

Can anyone help me solve this?