PPPD$HELP.HLB  —  SET  Qualifiers  /MRU
       /MRU=size

    Specifies the largest packet that can be received over the line.
    This value is used as part of the line negotiation, and the
    actual MRU setting can vary. Specify a value in the range of 6
    to 1500. The default packet size is 1500.
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