[mrtg] Re: IP address of device on a switch?

[Michael Votaw]

First, you will need to go to the switch.  You'll need to look through the
bridge table MIB which is in the Dot1dTpFdbTable (1.3.6.1.2.1.17.4.3.1).
This is where each MAC address known by the switch is stored along with the
port on which it is located along with the "state" like learned, static,
self, etc.

Once you know the MAC address, you'll need to find the IP (if that's what
you are looking for)  by going to the ARP table of the router.  If I'm not
mistaken (I was once already) the most routers dump their individual ARP
table entries after 30 minutes unless they hear from that MAC<>IP and then
they start the clock over again.  You can look in the router's ARP table
(atTable) and look in atPhysAddress 1.3.6.1.2.1.3.1.1.2

> -----Original Message-----
> From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
> Behalf Of Dan Colquhoun
> Sent: Wednesday, October 18, 2000 3:58 PM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Re: IP address of device on a switch?
>
>
>
> I'm still not finding the MACs of the address of the devices
> attached to the
> port.  All I can get is the MAC (and IP) of any devices
> performing managment
> functions.  This had been mentioned before, but I was curious if this was
> only a limitation of my switch or a general issue.
>
> Or are you saying that the router will have the IPs of all
> devices attached
> to the switch?  This still wouldn't show on which port on the switch the
> device was, would it?


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