[ubuntu] cannot surf or ping my isp even though im connected

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http://ubuntuforums.org – i refuse to accept that my problem does not have a solution. someone please help. the problem simply is that even while connected i cannot surf or ping my isp. my hardware is a huawei E156G usb modem. new clues: the system time gets changed and set back by 6hrs once i connect the modem. also wondering if its possibly ipv6 issues or maybe my isp does not assign me an ip address? its works ok in windows. nb i really know nothing about the ip part. (HowTos)