Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
2008-07-01
2008-07-01
Ngo, Ricky (Department: 2616)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S235000
Reexamination Certificate
active
10640819
ABSTRACT:
A receiving host in a TCP/IP network sends an acknowledgment indicating a received data packet is corrupt. The sending host will begin transmitting with a new field set in the IP header called a check-TCP-checksum bit, thereby requesting that all routers in the TCP/IP network perform a checksum on the entire received packet. Routers in the TCP/IP network will perform a complete checksum on an entire packet with the check-TCP-checksum bit set, and not just on the IP header. The routers continuously monitor the ratio of corrupt packets received on a particular port that fail the entire packet checksum to the total number of packets received on that port. If the ratio of corrupt-to-received packets exceeds a corruption threshold, the router assumes that the associated link is causing data corruption and issues a routing update indicating that the link is bad and should be avoided. Once the retransmission rate between the sender and receiver drops below a threshold level, the bad link has been detected and avoided within the TCP/IP network and the check-TCP-checksum option in the IP header is no longer set in data packets transmitted to the receiver host.
REFERENCES:
patent: 6097697 (2000-08-01), Yao et al.
patent: 6330614 (2001-12-01), Aggarwal et al.
patent: 6501754 (2002-12-01), Ohba et al.
patent: 6912196 (2005-06-01), Mahalingaiah
patent: 2003/0039245 (2003-02-01), Khosravi et al.
Banerjee Dwip N.
Jain Vinit
Vallabhaneni Vasu
Venkatsubra Venkat
Dillon & Yudell LLP
Ngo Ricky
Pifai D'Ann N.
Yuen Kan
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