发明名称 |
Unauthorized access prevention method, unauthorized access prevention apparatus and unauthorized access prevention program |
摘要 |
Unauthorized access from a network to a terminal is prevented. If a signaling packet received from an external terminal contains a virus, the signaling packet is discarded. If the signaling packet does not apparently contains a virus, an unnecessary part is deleted and the signaling packet is transferred to an internal terminal in response to a polling signal. A port number described in a response packet received from the internal terminal is translated to a different port number. If a session packet received from the external terminal does not conform to a predetermined protocol, the session packet is discarded. If the session packet received from the external terminal conforms to the predetermined protocol, a port number is subject to reverse translation and a resultant session packet is transferred to the internal terminal.
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申请公布号 |
US2005283827(A1) |
申请公布日期 |
2005.12.22 |
申请号 |
US20050152379 |
申请日期 |
2005.06.15 |
申请人 |
NEC INFRONTIA CORPORATION |
发明人 |
KOBAYASHI YOSHIKAZU |
分类号 |
G06F1/00;H04L9/00;H04L12/66;H04L29/06;(IPC1-7):H04L12/66 |
主分类号 |
G06F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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