| 摘要 |
A telnet security system ( 100 ) disposed in a network device ( 10 ) includes a detecting module ( 110 ) for detecting packets from a user, a network-determining module ( 120 ) for determining whether the user is on a valid network, a user-data determining module ( 130 ) for determining whether a detected packet from the user on the valid network includes valid user data, a setting-packet determining module ( 160 ) for determining whether a detected packet comprising the valid user data is a telnet setting packet, and a function-setting module ( 170 ) for setting a telnet function of the network device according to the telnet setting packet. An operation method of the telnet security system used in a network device is also provided.
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