DNS server filter checking for abnormal DNS packets
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 14, 2006
Grant Date -
Dec 13, 2001
app pub date -
Jan 2, 2001
filing date -
Jan 21, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A DNS server filter comprising a packet receiving section for receiving an inquiry from a terminal or a DNS server in a DNS protocol and a response packet from a DNS server, a session management section for managing inquiries and response packets for an entire control having a session management table for managing inquiry requests, a packet verification section for verifying whether the inquiry and the response packet are abnormal, a request generating section for generating an inquiry packet to the DNS server, a response generating section for generating a response packet returned to a transmission source of the inquiry packet, and a packet transmitting section for transmitting the inquiry and the response packet, wherein contents of the received DNS packet are checked that there is no abnormality before the received DNS packet is transmitted to the DNS server and an error response packet is generated and returned to a request source if an abnormality is detected.
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