[c-nsp] Getting ARP table from SNMP

[Swaroop Potdar]

Is that somehow possible to modify that code to poll for ARP entries for a interface which is in a VRF.
Your answer should be helpful.
 
Cheers,
Swaroop

	-----Original Message----- 
	From: Laurent Geyer [mailto:lgeyer at 085zehn.com] 
	Sent: Tue 10/17/2006 8:48 PM 
	To: Drew Weaver 
	Cc: cisco-nsp at puck.nether.net 
	Subject: Re: [c-nsp] Getting ARP table from SNMP
	
	

	On 10/16/06, Drew Weaver <drew.weaver at thenap.com> wrote:
	>
	>     Hi there, I read the archives and I found a similarly titled post
	> from some time ago, I am wondering if since that time any improvements
	> or additions have been added that may help me.
	>
	> Basically I am looking for the functionality in which I can supply an IP
	> address to my switch via SNMP and it will return the mac address which
	> it is sending ARP requests for that IP address.. so far this is what I
	> have:
	>
	> [root at nessie ~]# snmpget -v2c -c community switch
	> .iso.org.dod.internet.mgmt.mib2.at.atTable.atEntry.atPhysAddress.376.1.1
	> 92.168.0.1
	>
	>
	> RFC1213-MIB::atPhysAddress.376.1.192.168.0.1 = Hex-STRING: 00 90 7F 32
	> 90 92
	>
	> the problem I have with the above is simply that I do not know the port
	> id (376) beforehand, so is there anyway to simply send the IP address?
	
	
	A bit messy maybe, but you could just do a snmp bulk walk on atPhysAddress (
	1.3.6.1.2.1.3.1.1.2) and grep for the IP address.
	
	Something like this should work:
	
	`snmpbulkwalk -v2c -c <community string> <switch/router>
	1.3.6.1.2.1.3.1.1.2| grep <IP address>'
	
	Personally, I've written a perl script that  walks the ARP table  every now
	and again and stores the  information I'm after in a database.  This way I'm
	able to observe changes, and maintain a historical view of my ARP tables
	with a simple DBI based Perl script.
	
	I'm not much of a programmer but  if you're interested  I can clean my code
	up a bit and send you what I've got.
	
	-  Laurent
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