ICMP translator

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8477804
APP PUB NO 20080212609A1
SERIAL NO

11899000

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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When an IPv4/v6 dual stack terminal communicating via TCP on IPv6 fails to promptly switch over to IPv4 after the ICMPv6 fails due to a soft error, the problem should be resolved at the prior stage server rather than on the complicated terminal. The server at a stage prior to the terminal receives TCP packets from the terminal to find the TCP connection status on the terminal. When the terminal connection status is SYN-SENT or SYN-RECEIVED, and the server receives an unaddressed soft error such as ICMPv6 “Destination Unreachable: no route to destination (ICMP type=1: code 0)” for that terminal, the server rewrites the ICMPv6 contents as a hard error such as “Destination Unreachable: communication with destination administratively prohibited (ICMP type=1: code 1)” and sends it the terminal.

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First Claim

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Patent Owner(s)

  • HITACHI, LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nara, Masaki Yokohama, JP 5 30
Yoshimoto, Tetsuro Kokubunji, JP 27 515

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