[Xymon] Monitoring network traffic

Fri Apr 5 06:32:01 CEST 2024

Hi,

@Josh : Yes I saw it,  I hoped there's an easy way to reuse the data used for the trends presentation

@Norbert : Thanks's a lot that helps a lot. I'll adapt it to our needs

Kind regards

Rolf

Rolf Schrittenlocher

Bibliotheksmanagementsystem IT | IT-Services (ITS)

Universitätsbibliothek Johann Christian Senckenberg

Goethe-Universität Frankfurt  |  Campus Bockenheim

Zentralbibliothek  |  Freimannplatz 1

60325 Frankfurt am Main  |  GERMANY

Telefon Sammelnummer +49 (0)69  798 28830

Telefon persönlich +49 (0)69  798 28908

E-Mail: lbs-it at ub.uni-frankfurt.de

E-Mail (persönlich) r.schrittenlocher at ub.uni-frankfurt.de

Website: https://www.ub.uni-frankfurt.de

________________________________
Von: nor krie <norkrie at gmail.com>
Gesendet: Donnerstag, 4. April 2024 23:27
An: Josh Luthman
Cc: Schrittenlocher, Rolf; Xymon at xymon.com
Betreff: Re: [Xymon] Monitoring network traffic

Hi,

I created a server side script for all the *nix servers where I extract the network info from the clientlog.
The script identifies all server with a ssh column (this is clearly a *nix server) and then loops over all these targets to create a "nic" column with interface info.
Nothing to configure especially, a new *nic server will be automatically identified and get the column with detailed info and some graphs.

Some snippets to get the idea:

# grab all client info

get_all_info(){

  $XYMONBIN localhost "clientlog $TARGET"

}

ALLINFO=`get_all_info`

##################################################

# grab the nic details

get_nic_info(){

  echo "$ALLINFO" | \

    $NAWK '/^\[ifconfig/,/^\[route/' | \

    $GREP -v "^\["

}

##################################################

# grab the route

get_route_info(){

  echo "$ALLINFO" | \

    $NAWK '/^\[route/,/^\[netstat/' | \

    $GREP -v "^\["

}

##################################################

# grab the ports

get_ports_info(){

  ALLPORTS=`echo "$ALLINFO" | \

    $NAWK '/^\[ports/,/^\[ifstat/' | \

    $GREP -v "^\["`

  PORTSTATUS=`echo "$ALLPORTS" | \

    $NAWK '/^tcp/{print $NF}' | \

    $SORT -u`

  for stat in $PORTSTATUS

  do

    NUM=`echo "$ALLPORTS" | \

         $NAWK 'BEGIN{i=0}

                /'$stat'/{i++};BEGIN{i=0}

                END{print i}'`

    echo "tcp ports in status $stat: $NUM"

  done

}

# create the output to send to xymon

    echo "<h4>interface info</h4>"

    get_nic_info

    echo "<h4>route info</h4>"

    get_route_info

    echo "<h4>active tcp connections</h4>"

    get_ports_info

    showgraph ifstat_kB

All these data are then send to the xymon server daemon and create a nic column.

A complete run over 500 servers will take approx. 60 secs (but you can run more scripts in parallel if needed).

HTH

Norbert

Am Do., 4. Apr. 2024 um 19:21 Uhr schrieb Josh Luthman <josh at imaginenetworksllc.com<mailto:josh at imaginenetworksllc.com>>:
The clientlog includes [netstat] which has a snapshot of activity in text

The trends puts it in a pretty graph stored in rrd.

On Thu, Apr 4, 2024 at 4:30 AM Schrittenlocher, Rolf <R.Schrittenlocher at ub.uni-frankfurt.de<mailto:R.Schrittenlocher at ub.uni-frankfurt.de>> wrote:

Hi,

thanks Axel. I just saw that "trends" shows network traffic. So the data is already collected and available on the server. xymon server is Linux, only the clients are Solaris. So someone can tell me how I can access the data either with a client script or on server side?

kind regards

Rolf

Rolf Schrittenlocher

Bibliotheksmanagementsystem IT | IT-Services (ITS)

Universitätsbibliothek Johann Christian Senckenberg

Goethe-Universität Frankfurt  |  Campus Bockenheim

Zentralbibliothek  |  Freimannplatz 1

60325 Frankfurt am Main  |  GERMANY

Telefon Sammelnummer +49 (0)69  798 28830

Telefon persönlich +49 (0)69  798 28908

E-Mail: lbs-it at ub.uni-frankfurt.de<mailto:lbs-it at ub.uni-frankfurt.de>

E-Mail (persönlich) r.schrittenlocher at ub.uni-frankfurt.de<mailto:r.schrittenlocher at ub.uni-frankfurt.de>

Website: https://www.ub.uni-frankfurt.de

________________________________
Von: Axel Beckert <abe at deuxchevaux.org<mailto:abe at deuxchevaux.org>>
Gesendet: Donnerstag, 4. April 2024 10:17
An: Schrittenlocher, Rolf
Cc: Xymon at xymon.com<mailto:Xymon at xymon.com>
Betreff: Re: [Xymon] Monitoring network traffic

Hi Rolf,

Schrittenlocher, Rolf schrieb am Thu, Apr 04, 2024 at 07:45:58AM +0000:
> Our challenge at moment is how to monitor traffic quantity in/out in
> order to detect suspicious activities on Solaris 10. Is there are
> way to do this with xymon?

Definitely. ;-)

For our own use (in a university, too :-) and published via Debian's
hobbit-plugins package, I've written a plugin simply called "net"
which can check many network interface characteristics including
monitoring network traffic (calculating bytes/second average from the
rx/tx difference of 10 seconds), but so far it's just for Linux and
uses common Linux commandline tools and
/proc/ links:

https://salsa.debian.org/debian/hobbit-plugins/-/blob/master/src/usr/lib/xymon/client/ext/net

(It also uses the Hobbit.pm Perl module from the same package:
https://salsa.debian.org/debian/hobbit-plugins/-/blob/master/src/usr/share/perl5/Hobbit.pm)

It though shouldn't be too hard to adapt it to some Solaris
commandline tools and their output. I'm just not sure how to convert
the /proc/ stuff. Maybe there's a Linux compat mode like in FreeBSD?
(Haven't touched any Solaris for like 20 years or so, back when I was
a student.)

                Regards, Axel
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