This appears to be a fix in perlfunc, the older version on this site doesn't mention "unsigned" anywhere: 
    n   A short in "network" (big-endian) order.
    N   A long in "network" (big-endian) order.
    v   A short in "VAX" (little-endian) order.
    V   A long in "VAX" (little-endian) order.
          (These 'shorts' and 'longs' are _exactly_ 16 bits and
           _exactly_ 32 bits, respectively.)

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In reply to Re^2: Unexpected Network conversion behaviour for unpack by bart
in thread Unexpected Network conversion behaviour for unpack by GrandFather

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