Unknown-flow error

["Huiwen Li" <huiwenli@nortelnetworks.com>]

Hi, 

I am using SrcDest Hash Classifier with one of the nodes in my network
topology. I am wondering if anyone has experience in it? Currently I could
see the classifier is set as I want but when $ns run it gave me "unknown
flow" error. The strange thing is it could identify this flow before but it
couldn't for the third time. Can anyone please give me any suggestions? The
following is the error and the debug information I had. By the way, I also
change the original code of classifier.cc, etc and ns-route.tcl so that when
it is not the default classifier, the routing algorithm won't have effect on
the classifier slot table. 

classifier _o18  (SrcDest Hash Classifier)
        0 offset
        0 shift
        2147483647 mask
        11 slots
                slot 0: _o64      ;#src0->dest0(tcp), flow 0
                slot 1: _o118     ;#src1->dest1(tcp), flow 1
                slot 2: _o172     ;#src2->dest2(tcp), flow 2
                slot 3: _o226     ;#src3->dest3(tcp), flow 3
                slot 4: _o280     ;#src4->dest4(tcp), flow 4
                slot 5: _o334     ;#src5->dest5(udp), flow 5
                slot 6: _o388     ;#src6->dest6(udp), flow 6
                slot 7: _o442     ;#src7->dest7(udp), flow 7
                slot 8: _o496     ;#src8->dest8(udp), flow 8
                slot 9: _o550     ;#src9->dest9(udp), flow 9
                slot 10: _o28     ;#ack for TCP flows
        -1 default

#following is the value returned by printf("%d %d %d\n", mshift(h->saddr()),
mshift(h->daddr()), h->flowid()) in get_hash function.

src dest fid
4 6 0
 7 9 1
 10 12 2
 13 15 3
 16 18 4
 19 21 5
 22 24 6
 25 27 7
 28 30 8
 31 33 9
 19 21 5
 22 24 6
 25 27 7
 28 30 8
 31 33 9
 19 21 5
 -1      ;# return value for lookup(Packet *p)

ns: _o18 unknown-flow 19 21 5: 
    (_o18 cmd line 1)
    invoked from within
"_o18 cmd unknown-flow 19 21 5"
    invoked from within
"catch "$self cmd $args" ret"
    (procedure "_o18" line 2)
    (SplitObject unknown line 2)
    invoked from within
"_o18 unknown-flow 19 21 5"