IPv6 host discovery, SYN, incorrectly reporting targets down

["Paul Jenkins" <pjenkins () dsci com>]

Host that only respond with RST/ACK flags are reported as down, only
hosts that report back with SYN/ACK are reported as up.

Command used 

Nmap -6 -sP -PS22,23,80,443,37227 -iL _____

Using ipv4 addresses in the same environment yields the correct number
of hosts "up".

-Paul

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