[Flow-tools] Weirdness with flags in flow-print output

[Michael W. Lucas]

Hi,

I'm using flow-print 0.68.4 on FreeBSD, installed from a package.

I've noticed something odd with flow-print's representation of TCP
flags.  Here I'm using flow-print -f 1:

Sif  SrcIPaddress     DIf  DstIPaddress      Pr SrcP DstP  Pkts  Octets
 StartTime          EndTime             Active   B/Pk Ts Fl

0000 63.85.32.4       0000 207.46.209.247    06 c952 50    6095       326196    
 1201.11:58:00.409  1201.12:01:55.917    235.508 53  00 1a

0000 63.85.32.4       0000 207.46.209.247    06 c954 50    5860       315247    
 1201.11:58:00.451  1201.12:02:05.769    245.318 53  00 1a

1a= 26 or 11010 or ACK+PSH+SYN, a perfectly decent set of flags.

Here's the same set of flags with flow-print f 5:

Start             End               Sif   SrcIPaddress    SrcP  DIf   DstIPaddress    DstP    P Fl Pkts       Octets

1201.11:58:00.409 1201.12:01:55.917 0     63.85.32.4      51538 0     207.46.209.247  80    6   2  6095       326196    
1201.11:58:00.451 1201.12:02:05.769 0     63.85.32.4      51540 0     207.46.209.247  80    6   2  5860       315247 

The flags for these flows are shown as "2".  It's almost as if the
flags field in -f5 is getting trimmed?

Any thoughts?  Am I reading this wrong, or shall I file a bug?

Thanks,
==ml

-- 
Michael W. Lucas 	mwlucas at BlackHelicopters.org, mwlucas at FreeBSD.org
		http://www.BlackHelicopters.org/~mwlucas/
"My pessimism extends to the point of even suspecting the sincerity of
  the pessimists." -- Jean Rostand, French biologist and philosopher