On 04/04/2014 10:32, Peter Haag wrote:
> Hi Brian,
> Did you "upgrade" your Cisco device?
It's running ASA 8.4(7)
> It may come with a new version of
> ASA which does include not only incoming, but also outgoing byte counters.
>
> To test, use this format with nfdump:
> ./nfdump -r .. -o "fmt:%ts %evt %xevt %pr %sap -> %dap %ibyt %obyt %fl"
>
> This example lists your flows with both counters. Whether or not this
> additional counter is available is a question of the ASA version.
$ gzip -dc nfcapd.201404031445.gz | nfanon -K <snip> | nfdump -o
"fmt:%ts %evt %xevt %pr %sap -> %dap %ibyt %obyt %fl" | head
Date first seen Event XEvent Proto Src IP
Addr:Port Dst IP Addr:Port In Byte Out Byte Flows
2014-04-03 14:44:59.963 DELETE 2027 TCP 193.55.189.187:53443 ->
193.120.53.218:8000 127 259 1
2014-04-03 14:44:59.983 DELETE 2030 TCP 127.33.194.23:37685 ->
142.49.214.245:80 0 0 1
2014-04-03 14:45:00.203 DELETE 2027 TCP 193.55.189.187:53446 ->
193.120.53.218:8000 127 259 1
2014-04-03 14:45:00.203 DELETE 2016 UDP 193.55.189.187:52511 ->
40.8.128.6:53 34 121 1
2014-04-03 14:45:00.203 DELETE 2016 UDP 193.55.189.187:55583 ->
40.8.128.6:53 34 64 1
2014-04-03 14:45:00.223 DELETE 2016 UDP 193.55.189.185:44187 ->
40.8.136.9:53 82 165 1
2014-04-03 14:45:00.233 DELETE 2030 TCP 193.55.189.185:55142 ->
74.129.251.247:80 161 459 1
2014-04-03 14:45:00.353 DELETE 2016 ICMP 193.55.187.219:0 ->
193.55.185.110:8.0 68 68 1
2014-04-03 14:45:00.363 DELETE 2027 TCP 193.55.189.187:53449 ->
193.120.53.218:8000 127 259 1
> nfdump adds up both input and output in the summary line. The statistic
> output however, does only print the incoming bytes for compatibility and
> historic reason. That's where the difference comes from.
So you're saying that the -s proto/bytes is showing only the sum of the
input values, not the output?
$ gzip -dc nfcapd.201404031445.gz | nfdump -N | perl -ne 'if
(/^\S+\s+\S+\s+\S+\s+\S+\s+(\S+).*\s+(\d+)\s+(\d+)$/ && $1 == 6) {
$flows+=1,$in+=$2,$out+=$3; } END { print
"flows=$flows,in=$in,out=$out\n"; }'
flows=15370,in=106062229,out=11962700182
You're right: 106062229 is the value shown by -s proto/bytes for TCP.
Problem is, I'm trying to use nfsen to drill-down to locate the biggest
offender, but 99% of the traffic is not counted :-(
I originally started grouping by source or destination address, and was
surprised to see only relatively small flows. Grouping by proto was just
to make the missing traffic obvious.
Regards,
Brian.
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