How many gigabytes do you consume per month? Not many people can answer that question, complicating the efforts of Internet service providers to get their subscribers to stay below a certain amount of data per month. In August, Netgear plans to introduce a $190 router that will provide the first easy way for users to get a grip on their Internet traffic. Netgear said it will include the feature on future models, eventually making it a standard, and provide software upgrades for older devices.