| 摘要 |
There is provided a method, system and Local Area Network (LAN) card for blocking access to harmful sites, which is capable of blocking access to harmful sites by installing a memory storing a harmful site list in the LAN card and examining whether all packets passing through the LAN card are packets transmitted/received to/from harmful sites. A harmful site list and/or a valid site list are sotred in the LAN card of the present invention. An address distinguishing unit in the LAN card examines all packets passing through the LAN card and blocks packets trnasmitted/received to/from harmful sites. Additionally, in order to perform rapid searches, information on whether recently accessed sites correspond to valid sites or harmful sites is stored in a buffer and it is determined whether an address corresponds to a harmful or harmful site. For a site that is not presentin the valid site list and the harmful site list, it is inquired of a server for providing a harmful/valid site list updating service about whether the site is harmful or valid. The packet relating to the site is stored in a queue until a response to the inquiry arrives. Additionally, new harmful and valid site lists are downloaded from harful and valid site lists providing servers at regular intervals, and the harmful and valid site lists are updated.
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