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    • 1. 发明授权
    • Prevention and detection of IP identification wraparound errors
    • 预防和检测IP识别环绕错误
    • US06894976B1
    • 2005-05-17
    • US09595599
    • 2000-06-15
    • Gaurav BangaHenk J. BotsMark Smith
    • Gaurav BangaHenk J. BotsMark Smith
    • H04L12/26H04L29/06
    • H04L69/16H04L69/166
    • 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.
    • 一种生成IP数据报IP标识号的方法。 维护多个IP识别码发生器。 多个接收站与多个IP识别码发生器相关联,使得每个接收站具有与之相关联的IP识别码发生器。 基于相关联的IP标识号生成器的输出,为发送到接收站的数据报生成IP标识号。 而且,一种减少从分段的IP数据报中收到的数据片段的错误组合的可能性的方法。 数据片段具有IP标识号。 在检测到具有IP识别号码的重叠数据片段的接收时,数据报的所有接收到的数据片段被丢弃。 重新组装数据报的超时减少了。 首先,重新组装数据报的超时被减少到小于标准超时。 第二,在检测到接收到的数据片段中的间隙时,超时被减少。 第三,在检测到具有相同协议标识号和源地址但具有不同IP标识号的数据报时,超时减少。 此外,还提供了检测来自分段IP数据报的数据片段的错误组合的可能性的方法。 检测发送站和接收站之间的通信错误。 确定与接收站相关联的IP识别码发生器的速率卷绕在一起的速率。 确定NFS重传。 基于这些中的一个或多个,在接收站处的错误组装的可能性被确定为高。