I would bet money that there is a reverse-lookup record in your DNS. Try
'nslookup xx.xx.xx.xx' on the address you think the trap is coming from.
That is the only way this is possible. Many DNS systems require two steps
to make an address resolve in both directions, and a significant portion of
my services hours are spent uncovering messiness in DNS systems.
Cordially,
Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
(248) 552-4968 Voicemail, Fax, Pager
Tom Clarke
<tclarke@island.c To: Leslie
Clark/Southfield/IBM@IBMUS
om> cc:
Subject: RE: [nv-l] Traps as
IP's Rather Than Names
04/16/2003 01:53
PM
Thank for the response Leslie. What is wierd is that I renamed a device in
my hosts file, and I've pinged the name to be certain it was renamed. I
even
pinged the old name to make sure it no longer resolved. Everything seemed
to
be okay. I did a complete network rediscovery and it discovers the correct
name. Events coming from netmon give off the correct name. It's just when
traps come in from my Cisco devices that the old name shows up in the
events
browser. The source interface that the traps are coming in from on the
Cisco
is set correctly as well. The old name no longer exists anywhere but with
these traps.
-----Original Message-----
From: Leslie Clark [mailto:lclark@us.ibm.com]
Sent: Monday, April 14, 2003 9:20 AM
To: Tom Clarke
Subject: Re: [nv-l] Traps as IP's Rather Than Names
Tom, the name that appears in the events display for an incoming trap
depends
entirely on name resolution. There is an address in the trap, set by the
sending
device. The Netview events application resolves it as best it can. You
want that
address to resolve to the same name as the node was discovered by so you
can
do correlation, of course. You have two choices:
1) Add resolution for those addresses to your DNS or hosts file OR..
2) Configure the devices to use a predictable, named interface as the
source
when it sends the traps (like the loopback). This is configurable on most
Cisco routers.
Cordially,
Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
(248) 552-4968 Voicemail, Fax, Pager
Tom Clarke
<tclarke@island.c To:
nv-l@lists.tivoli.com
om> cc:
Subject: [nv-l] Traps as
IP's Rather Than Names
04/07/2003 05:04
PM
Platform: Win2kServer
Version: 7.1.2
I'm receiving traps from my Cisco devices but for some of the sources show
up as the ip address rather than the actual name. This is not for all
devices but a select few. After making hosts file additions after initial
discovery and rediscovering the devices I thought it might have fixed the
problem but it hasn't. Is there a way that I can modify the names of
devices coming in as traps manually?
thanx in advance.
Thomas Clarke
Sr. Network Operations Engineer
The Island, ECN
(212)231-5010
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