[ubuntu] Error : can not access internet with ADSL modem

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http://ubuntuforums.org – I using Ubuntu 10.04 desktop edition In the morning, i still can access internet with ASDL modem connection. I used command in terminal like this as usual : sudo pon dsl-providerAnd then i use my laptop to make some PHP project.... Suddenly, i can not access internet any more. Than i restart my computer, type in sudo pon dsl-provider and it show : Plugin rp-pppoe.so loaded RP-PPPoE plugin version 3.8p compiled against pppd 2.4.5 Still can not access internet. Then i try to change to another computer, the connection is ok and i can browse like usual. What happen here? Even my modem is off (HowTos)