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 <
user-4c45a83f15cb@xymon.invalid>:

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 <
user-c8b69be9a15a@xymon.invalid> 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)


Universit?tsbibliothek Johann Christian Senckenberg

Goethe-Universit?t Frankfurt  |  Campus Bockenheim

Zentralbibliothek  |  Freimannplatz 1

60325 Frankfurt am Main  |  GERMANY

Telefon Sammelnummer +49 (0)69  798 28830

Telefon pers?nlich +49 (0)69  798 28908

E-Mail: user-64314bfd1eb5@xymon.invalid

E-Mail (pers?nlich) user-c8b69be9a15a@xymon.invalid

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


*Von:* Axel Beckert <user-bc188e45dae4@xymon.invalid>
*Gesendet:* Donnerstag, 4. April 2024 10:17
*An:* Schrittenlocher, Rolf
*Cc:* 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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