| 摘要 |
A system method and apparatus are provided for use in monitoring or controlling internet access at a client device 12. A request message 500 is generated to request categorization of a specified URL, and a reply message 600 is returned denoting a category of the specified URL amongst a predetermined set of categories. The request message 500 comprises a UDP package including a sequence number, a time stamp, and a data section carrying the specified URL. The reply message 600 comprises a UDP packet and includes the sequence number and the time stamp from the request message 500, and a data section identifying the category. The request message 500 and the reply message 600 are economical and provide efficient communication across a local area network or the Internet 20.
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