Unable to configure Linksys E2500 to use PPPoE connection

I am using the Ubuntu Linux 12.04 operating system and have been able to use the Linksys E2500 router with Automatic Configuration – DHCP setting and my modem in PPPoE mode to use my DSL connection. But I would like to be able to use my router with the PPPoE connection setting so I can use a firmware like Tomato which has more advanced features like bandwidth logging.
I was able to log into the configuration page of my SpeedTouch ST516 modem and set it to bridge mode according to the instructions here: http://www.speedtouch.ca/bridgemode.php
I then tried to set up the router to use PPPoE according to the instructions here: http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=3687
I get the message "Can not get an IP address from PPPoE" again when I try to set up the connection in step 4. Resetting the router does not help. I also tried running 'sudo service networking restart' and the 'sudo dhclient -r; sudo dhclient' in Ubuntu's terminal but still got the same message.
I double checked that I used right login information and vpi from my ISP. I used the same info to configure the modem to PPPoE mode again so I can connect to the internet. I had to reset the modem back to factory defaults using the reset button at the back to access the modem configuration page after I disconnected the ethernet cable from the router and plugged it into the modem.
Is there a possible bug with using PPPoE with this router? Is there anything else I can try besides what is stated in the instructions linked to above?

jaymay
"If you are getting an error "Can't get an IP from PPPoE Server", that would mean that it's possible that the account information you've typed in is incorrect or the modem is not set properly to bridged mode. You can test this by connecting your computer directly to the modem and create a PPPoE dialer. If it will let you connect successfully then you are using the correct username and password. If not then you might have to verify the correct info from your ISP."
> Again, "I double checked that I used right login information and vpi from my ISP. I used the same info to configure the modem to PPPoE mode again so I can connect to the internet." And yes I was also able to connect with a PPPoE dialer and computer directly connected to the modem.
"It could be possible that what you just need to do in the router is to change it's LAN IP address to a different range compared to what you are getting from the modem to avoid IP conflict. For more information about setting up the router with DSL connection, you may refer to this link: Setting up a Linksys router for DSL Internet connection."
> That link is exactly the same link in my sentence: "I then tried to set up the router to use PPPoE according to the instructions here: http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=3687"
The router ip address used is set to http://192.68.2.1 which differs from the ip addresses of the modems I tried.

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