Looking for App that checks Internet Connectivity while on wifi

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http://androidforums.com – Is there an app that can check internet connectivity when connected to wifi and give an icon in the notification status bar if internet connectivity is lost? Almost everything I've seen gives notification on wifi connectivity, but does not give notification on no or limited internet access. Essentially I'm looking for some notification similar to the yellow triangle we get on our windows PC. Thanks. LB (General)