[mrtg] Re: monitoring traffic in & out of Linux box

[tony bourke]

Hello Ragnar,

I wanted to double check, so I set up a little test.  I ran a continuous 
FTP from one machine to another:  

gcc-2.95.2-sol8-sparc-local:        65147904 bytes    2.78 MB/s          
gcc-2.95.2-sol8-sparc-local:        65147904 bytes    3.13 MB/s          
gcc-2.95.2-sol8-sparc-local:        65147904 bytes    2.81 MB/s          

I ran MRTG on the Linux machine and the Cisco switch the Linux machine was
connected to.       

Switch:

973396800 3201972 64646 3205835 64724
973396500 3113714 62883 3116689 62938
973396200 3019427 61154 3159151 62925
973395900 3159151 62937 3159151 63888

Linux:

973396800 3194833 54656 3198528 54720
973396500 3095909 52969 3097773 52997
973396200 3018904 51806 3164114 53029
973395900 3164114 53036 3164114 54201

There were some minor differences all within 1% (if I did my math right),
which could be chocked up to statistical error, but it appears the Linux
results can be trusted.  This was a 2.2 Kernel, but I believe the others
were ok too (I used MRTG on linux machines 2 years ago, never noticed a
problem).

Tony


On Sat, 4 Nov 2000, [iso-8859-1]
Ragnar Kjørstad wrote:

> 
> On Sat, Nov 04, 2000 at 04:19:48PM -0500, tony bourke wrote:
> > > linux doesn't do network accounting on the number of bytes transfered,
> > > only the number of packets. (at least it used to). You can do byte
> > > accounting by using ipchains, but it's a little bit more work to setup.
> > 
> > Are you sure about that?  The ifconfig only shows packets, but I've always
> > been able to get accurate bps (bits per second) with MRTG and linux runing
> > ucd-snmpd.  When ever I set up MRTG, i usually set it up on the switch and
> > the server, so I can compare the two.  I'm pretty sure Linux has always
> > been ok for me, and this is dating back several years.
> 
> OK, it appers to be fixed in linux-2.2, so my comment only apply to
> linux-2.0. (and still it returns number of bytes, but it is an estimate,
> from the number of packets transfered).
> 
> 
> -- 
> Ragnar Kjørstad
> 
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-------------- -- ---- ---- --- - - - -  -  -- -  -  -  -   -     -
Tony Bourke				tony at vegan.net



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