I cannot get nfdump to display the subnets and the raw nfdump output does not 
seem to include this information:
Flow Record:
  Flags        =              0x00 Unsampled
  size         =                52
  first        =        1305017995 [2011-05-10 09:59:55]
  last         =        1305017996 [2011-05-10 09:59:56]
  msec_first   =               899
  msec_last    =               259
  src addr     =     192.168.228.87
  dst addr     =     192.168.21.37
  src port     =             36887
  dst port     =                80
  fwd status   =                 0
  tcp flags    =              0x1e .APRS.
  proto        =                 6
  (src)tos     =                 0
  (in)packets  =                 7
  (in)bytes    =              2884
  input        =               173
  output       =               175
  src as       =                 0
  dst as       =                 0


/usr/local/bin/nfdump -M /data/nfcapd/flows/router -R 
2011/05/10/nfcapd.201105100000:2011/05/10/nfcapd.201105102355 -n 5 -s mask:p/bps

Top 5 Mask ordered by bps:
Date first seen          Duration Proto              Mask    Flows(%)     
Packets(%)       Bytes(%)         pps      bps   bpp
2011-05-09 23:58:56.717 86461.844 any                   0   50.9 M(200.0)    
1.7 G(200.0)  744.0 G(200.0)    19734   68.8 M   436

Summary: total flows: 25471290, total bytes: 372.0 G, total packets: 853.1 M, 
avg bps: 34.4 M, avg pps: 9867, avg bpp: 436
Time window: 2011-05-09 23:58:56 - 2011-05-10 23:59:58
Total flows processed: 25471290, Blocks skipped: 0, Bytes read: 1324528668
Sys: 3.330s flows/second: 7649036.0  Wall: 28.248s flows/second: 901670.8


We are using Netflow v5 is this information only included in a certain version 
of netflow packet?
Looking at the docs for v5 it shows
44           src_mask             Source address prefix mask bits
45           dst_mask            Destination address prefix mask bits.

Neale Guy
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