watching Layer 2 device

Giles Coochey gcoochey at sapphire.gi
Fri Jul 20 12:26:39 CEST 2007


Ah yes, very true...

I'l revise my suggestion to check the mac address table on the switch that the device is connected to... my guess is a check by ssh or telnet that executes something like:

Show mac-address-table abcd.abcd.abcd

And checks for any output, would work.

Of course the mac address aging time may be longer than your notification requirements.

-----Original Message-----
From: Patrick M. Hausen [mailto:hausen at punkt.de] 
Sent: 20 July 2007 12:23
To: Giles Coochey
Cc: Kurt Yoder; Brandino Andreas; Nagios Users mailinglist
Subject: Re: [Nagios-users] watching Layer 2 device

Hello!

> Check the ARP table on a host that communicates with this layer 2
> device.

ARP is to match IP addresses to layer 2 addresses. IP addresses
are layer 3. No IP, no ARP. Sorry.

If the layer 2 device in question is a bridge, you could
watch if it emits BPDU frames regularly and raise an alarm
if it doesn't for a defined period of time.

HTH,

Patrick M. Hausen
Leiter Netzwerke und Sicherheit
-- 
punkt.de GmbH * Vorholzstr. 25 * 76137 Karlsruhe
Tel. 0721 9109 0 * Fax 0721 9109 100
info at punkt.de       http://www.punkt.de
Gf: Jürgen Egeling      AG Mannheim 108285

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