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List:       opennms-discuss
Subject:    Re: [opennms-discuss] Discovering devices without IP address
From:       Giles Coochey <giles () coochey ! net>
Date:       2012-03-30 14:26:32
Message-ID: 4F75C298.7020707 () coochey ! net
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On 30/03/2012 02:01, John Blake wrote:
> Does it have a MAC address?
> Maybe you can find it that way.
>
>
>
>
>
> From:	Pedro Jimenez<pedrojg84@hotmail.com>
> To:	<opennms-discuss@lists.sourceforge.net>,
> Date:	03/29/2012 05:50 AM
> Subject:	[opennms-discuss] Discovering devices without IP address
>
>
>
> Hi all!
>
> Monitoring the network, I have found an issue I would like to check: there
> are some users that are connecting a Hub, so 3-4 PCs are connected to the
> "same" interface (well, in this particular case, I have found a single user
> connected to the Hub, and the Hub to the switch). If I list the nodes
> available, the Hub doesn´t appear, and if I enable Linkd and draw the
> topology, I can see:
>
> |NETWORK | ---------------- SWITCH -------------------- PC
>
If you are using Cisco switches which have the port security feature, 
you can configure them to send a SNMP trap when more than x MAC 
addresses register on a single port.

Hubs have no MAC addresses and un-managed switches don't either as far 
as I'm aware.

-- 
Best Regards,

Giles Coochey
NetSecSpec Ltd
UK Mobile: +44 7983 877 438
Business Email: giles.coochey@netsecspec.co.uk
Email/MSN/Live Messenger: giles@coochey.net
Skype: gilescoochey



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