Re: [nv-l] Discovery

[Gareth Holl <gholl@us.ibm.com>]

Page 42 of the version 7 Configuration
Guide states:
"netmon discovers individual IP
addresses and host nams in a seed file regardless of whether they lie outside
the groups of nodes in the seedfile or regardless of whether they are included
in a group of nodes specified with the !"

In other words, specific entries take
priority. Probably the only entry to have a higher priority would be an
entry using the same specific IP address but with a !, but then again why
would you do that :-)

The Config guide has a good explanation
of the use of the seedfile.

Hope this helps.

Gareth Holl
Staff Software Engineer
gholl@us.ibm.com

IBM Software Group - Tivoli Brand
Research Triangle Park,  North Carolina.

Meyos Yemveng <yemveng@yahoo.ca>
Sent by: owner-nv-l@lists.us.ibm.com

05/05/2004 12:14 PM

Please respond to
nv-l

To	nv-l@lists.us.ibm.com
cc
Subject	Re: [nv-l] Discovery

Thanks Folks,
More QUestions
 
Q1: Let's say myy seed file have the following two entries:
 
node1.mydonaine.com #IP=192.168.15.12
!192.168.15* #Do not discover these IP range
 
Would my node1 be discovered?
 
Q2: Best practice Advice on Discovery.
- Should you control your discovery via the seed file
content (@limit_discovery)?
- Should you a combination of sedd file entries and IP
restrictions while allowing auto-discovery?
- What wold you suggest for a network of Servers and Routers?

Jane Curry <jane.curry@skills-1st.co.uk> wrote:
Please see inserted comments.
Cheers,
Jane

Meyos Yemveng wrote:

> Hi Folks,
> I would like to clarify some discovery issues
> 1- I want to limit Netview to only discover what I have in the seed
file
> Q1: do I need to specify what IP range not to discover again? 
> !102.105.123.*

You need to turn off automatic discovery if you really want to limit 
discovery to what is in the seedfile. If you have a Unix NetView, you 
want Options -> Topology/Status Polling -> and untick the "Discover
New 
Nodes" box. When you do this, wildcard entries in your seedfile are
irrelevant - ALL wildcards - includes and excludes. The only things 
NetView will discover will be explicit seedfile entries like 1.2.3.4 or
fred.bloggs.com. Nothing with * ? or ranges with hyphens, will be 
discovered. This may not be the be! haviour you want!

> Q2: What should I Do
> 

If you don't have too many nodes that you want to discover and you are
prepared to hand-maintain your seedfile, then do as above. If you don't
want to create an explicit entry for each node you want to find then you
need to turn auto-discovery back ON and find a combination of inclusion
and exclusiion wildcard entries for your seedfile that achieves the 
desired effect. Have you looked at the @OID style of seedfile entry to
limit discovery to specific types of SNMP agent? That can be very 
powerful for preventing discovery of nodes.

> Q3- I want to prevent unwanted Nodes to be discovered such as Nodes
> detected by ICMP and SNMP Ping sweeps and SNMP Cold/Warm start Traps
?
> 

Doesn't matter what the polling mechanism is - if the seedfile permits
it - it gets discovered; otherwise it doesn't.

> Q4- Any other suggestions?
> 

You might l! ook at taking the NetView for Unix for Administrators class
(or the Windows version if your NetView is Win based). We spend the 
best part of a day on understanding discovery / seedfiles / 
location.conf / etc.

>
>
> Thank You,
> Meyos
> "ALLEZ LES LIONS INDOMPTABLES"
>
>
> ------------------------------------------------------------------------
> Post your free ad now! *Yahoo! Canada Personals* 
> 


-- 
Tivoli Certified Consultant & Instructor
Skills 1st Limited, 2 Cedar Chase, Taplow, Bucks, SL6 0EU, UK
Tel: +44 (0)1628 782565
Copyright (c) 2004 Jane Curry . All rights reserved.



Thank You,
Meyos 
"ALLEZ LES LIONS INDOMPTABLES"

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