Re-Connection of Internet - Connected but No Access.

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https://bbs.archlinux.org – After Starting the system, first- time connection of internet works/access  the net-works(updating, browsing, etc.).but if, internet is disconnected, manually by me or automatically by any reason. Re-connection of internet does'nt work (connected, but no access).Only reboot & fresh first connection brings the network access again.I noticed this problem & want to fix it (i am using mobile broadband Usb-modem for internet connection).please reply (any idea/ own experience). real https://bbs.archlinux.org/profile.php?id=62010 2012-08-21T07:26:36Z (HowTos)