I wonder if this is a know bug for nprobe 6.1.6.
# nprobe --version
Welcome to nprobe v.6.1.6 ($Revision: 1835 $) for i686-redhat-linux-gnu
with native PF_RING acceleration.
I am generating a single TCP flow using netcat between 2 nodes:
30.3.0.10:12345 -> router with nprobe running -> 40.4.0.10:12345
NetCat commands used:
client: nc -T lowdelay -v -n -p 12345 -s 30.3.0.10 40.4.0.10 12345
server: nc -v -l -n 12345
With this single flow nprobe generates 3 NetFlow records! Here is
WireShark output from the node that acts as a collector:
Frame 24637 (210 bytes on wire, 210 bytes captured)
Ethernet II, Src: Cisco_8b:09:40 (00:16:9c:8b:09:40), Dst: Sony_1c:f4:22
(00:1d:ba:1c:f4:22)
Internet Protocol, Src: <router IP>, Dst: <my box running WireShark>
User Datagram Protocol, Src Port: iop (2055), Dst Port: iop (2055)
Cisco NetFlow/IPFIX
Version: 5
Count: 3
SysUptime: 2035100826
Timestamp: Apr 21, 2011 14:23:11.000000514
FlowSequence: 0
EngineType: 1
EngineId: 8
00.. .... .... .... = SamplingMode: No sampling mode configured (0)
..00 0000 0000 0001 = SampleRate: 1
pdu 1/3
SrcAddr: 30.3.0.10 (30.3.0.10)
DstAddr: 40.4.0.10 (40.4.0.10)
NextHop: 0.0.0.0 (0.0.0.0)
InputInt: 2053
OutputInt: 0
Packets: 14
Octets: 975
[Duration: 11.988000000 seconds]
StartTime: 2035059.064000000 seconds
EndTime: 2035071.052000000 seconds
SrcPort: 12345
DstPort: 12345
padding
TCP Flags: 0x19
Protocol: 6
IP ToS: 0x10
SrcAS: 0
DstAS: 0
SrcMask: 0 (prefix: 30.3.0.10/32)
DstMask: 0 (prefix: 40.4.0.10/32)
padding
pdu 2/3
SrcAddr: 30.3.0.10 (30.3.0.10)
DstAddr: 40.4.0.10 (40.4.0.10)
NextHop: 0.0.0.0 (0.0.0.0)
InputInt: 2053
OutputInt: 0
Packets: 1
Octets: 74
[Duration: 0.000000000 seconds]
StartTime: 2035059.061000000 seconds
EndTime: 2035059.061000000 seconds
SrcPort: 12345
DstPort: 12288
padding
TCP Flags: 0x02
Protocol: 6
IP ToS: 0x10
SrcAS: 0
DstAS: 0
SrcMask: 0 (prefix: 30.3.0.10/32)
DstMask: 0 (prefix: 40.4.0.10/32)
padding
pdu 3/3
SrcAddr: 30.3.0.10 (30.3.0.10)
DstAddr: 40.4.0.10 (40.4.0.10)
NextHop: 0.0.0.0 (0.0.0.0)
InputInt: 2053
OutputInt: 0
Packets: 1
Octets: 72
[Duration: 0.000000000 seconds]
StartTime: 2035064.907000000 seconds
EndTime: 2035064.907000000 seconds
SrcPort: 12288
DstPort: 12345
padding
TCP Flags: 0x18
Protocol: 6
IP ToS: 0x10
SrcAS: 0
DstAS: 0
SrcMask: 0 (prefix: 30.3.0.10/32)
DstMask: 0 (prefix: 40.4.0.10/32)
padding
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