It appears to be as follows. 
1 = FIN
2 = SYN
4 = RST
8 = PSH
16 = ACK
32 = URG

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What ever number is returned from the $tcp->{'flags'} represents what packet set was seen. Ex: SYN ACK = 2 + 16 resulting in 18.

In reply to Re^2: NetPacket::TCP output by Anonymous Monk
in thread NetPacket::TCP output by Benedict

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