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Hi Maurizio,
An AS-AS matrix can be created more easily as follows:
./nfdump -M <source_list> -R nfcapd.$tart_tslot:nfcapd.$end_tslot
- -s record/bytes -A srcas,dstas -n 0 -o "fmt:%sas %das %byt"
This generates you a list of all AS to AS relations, with a custom output
format. You may of course add any additional field in the custom output format,
you may need for your purpose. This output can
be easily parsed and used for further processing.
Therefore a single run gives all required information, no need for filtering
either, and therefore no need for parallel filters, which btw. is the way
nfprofile handles multiple channels :)
Hope this helps
- Peter
- -------- Original Message --------
From: Maurizio Molina <[EMAIL PROTECTED]>
To: nfsen-discuss ML <[email protected]>
Subject: [Nfsen-discuss] AS-AS traffic matric - backend plugin
Date: Tue Oct 24 2006 18:05:16 GMT+0200 (CEST)
> Hi,
> I'm writing a backend plugin to obtain a daily AS-AS traffic matric in
> my network, with 38 ASs and 21 sources.
> The only way I found so far is to get the information with nfdump (1.5)
> running
>
> #nfdump -M <source_list> -R nfcapd.$tart_tslot:nfcapd.$end_tslot -n 50
> -s srcas/bytes -o long "src as $src_as and dst as $dst_as"
>
> as many times as all the possible AS-AS pairs (38X38), and then parse
> the output.
> Note that I use -n 50 but I could vell have used -n 1 (because of the
> filtering, I always get that there is only one contributing src_as).
> The problem is that given the number of flows (roughly: 300 k flows per
> source and per hour, with each AS connected to one, or two, or three
> sources at most), the processing time is high.
> I probably won't be able to run the processing every day over all the
> past 24 hours, but I'll be forced to focus on a limited time slice.
> Questions:
> 1) is there another easy way to do?
> 2) if not, how difficult would it be (and what module should be
> modified) to let nfdump have prallel filters? The processing bottleneck
> is clearly the disk access bandwidth (the cpu stays at about 4-5%).
>
> Regards,
> Maurizio
>
>
>
> -------------------------------------------------------------------------
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- --
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Peter Haag, Security Engineer, Member of SWITCH CERT
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-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Nfsen-discuss mailing list
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