Prevention and detection of IP identification wraparound errors

Details Prevention and detection of IP identification wraparound errors Prevention and detection of IP identification wraparound errors

2005-05-17

2005-05-17

Yao, Kwang Bin (Department: 2667)

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

C370S244000, C370S474000

Reexamination Certificate

active

06894976

ABSTRACT:
A method of generating IP identification numbers for IP datagrams. A plurality of IP identification number generators are maintained. A plurality of receiving stations are associated with the plurality of IP identification number generators such that each receiving station has an IP identification number generator associated therewith. An IP identification number is generated for a datagram sent to a receiving station based on an output of the associated IP identification number generator. Also, a method of reducing a likelihood of misassembly of received data fragments from fragmented IP datagrams. The data fragments have an IP identification number. All received data fragments of the datagram are discarded upon detection of receipt of an overlapping data fragment having the IP identification number. Timeouts for reassembling datagrams are reduced. First, timeouts for reassembling the datagrams are reduced to less than a standard timeout. Second, timeouts are reduced upon detection of a gap in the received data fragments. Third, timeouts are reduced upon detection of a datagram having the same protocol identification number and source address, but having a different IP identification number. Furthermore, a method of detecting a likelihood of misassembly of data fragments from fragmented IP datagrams. Communication errors between a sending station and a receiving station are detected. A rate is determined at which an IP identification number generator associated with the receiving station wraps around. NFS re-transmissions are determined. Based on one or more of these, a likelihood of misassembly at the receiving station is determined to be high.

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