RE: Getting IP address of devices connected to a switch

> -----Original Message-----
> From: [email protected]
[mailto:net-snmp-users-
> [email protected]] On Behalf Of Roy M. Silvernail
> Sent: Wednesday, June 04, 2008 10:20 AM
> To: amar
> Cc: [email protected]
> Subject: Re: Getting IP address of devices connected to a switch
> 
> On Wed, Jun 04, 2008 at 07:36:50PM +0530, amar wrote:
> > Hi,
> >
> > How can I get the IP address of the devices that are connected to a
> switch?
> > Is there any OID that can fetch them?
> 
> Depends on what you mean by "connected".  If you mean the devices
> plugged into the switch ports, no.  If you're looking for the
addresses
> of devices holding a TCP connection to the switch,
> RFC1213-MIB::tcpConnTable has that.
> --
> Roy M. Silvernail is [email protected], and you're not
>    "A desperate disease requires a dangerous remedy."
>                    - Guy Fawkes
>             http://www.rant-central.com
> 
For some manufacturers (e.g. Cisco) you CAN get the MAC address of
device - look through dot1dTpFdbAddress. You need to get IP address/MAC
pairings from routers via atPhysAddress and then 'smush' those together.
Following are a few of my notes:
# dot1dTpFdbAddress contains the Bridge Table with MAC addresses heard
on each port. 
# It's indexed by a decimal representation of the MAC address which is
its value.
#
#
# dot1dTpFdbStatus contains either "mgmt", "self", or "learned" for each
MAC address
# It's indexed by a decimal representation of the MAC address  like
dot1dTpFdbAddress

#
# dot1dTpFdbPort maps the index into dot1dTpFdbAddress to a bridge port
number
#
#
# Finally, dot1dBasePortIfIndex maps the value from dot1dTpFdbPort into
an ifIndex
#

Al

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