nv-l

Re: Nameserver

2001-11-01 16:12:50
Subject: Re: Nameserver
From: "Leslie Clark" <lclark AT us.ibm DOT com>
To: nv-l AT lists.tivoli DOT com
Date: Thu, 1 Nov 2001 16:12:50 -0500
This emphasizes a point I believe I mentioned recently, and that is:
Netview does not change the name of a node if you LOSE name
resolution. It also does not change the value of the 'isSNMPSupported'
field if you lose SNMP access.  These are two external factors
that it pays to keep an eye on. Because of this, I like to keep a
utility script handy and check from time to time. A script that does
an snmpget of sysName against the Selection Name will tell you
both things at once.  This is especially helpful when you are first
setting up Netview and it is uncovering all sorts of little anomalies
in your network. If you have such a report, you can just hand it to
the responsible parties. And you can use it to verify the progress
of your cleanup.

Cordially,

Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
Detroit


                                                                                
          
                    Robin James                                                 
          
                    <[email protected]       To:     IBM NetView Discussion 
<nv-l AT tkg DOT com> 
                    esatm.com>              cc:                                 
          
                    Sent by:                Subject:     Re: [NV-L] Nameserver  
          
                    owner-nv-l AT tkg DOT co                                    
                 
                    m                                                           
          
                                                                                
          
                                                                                
          
                    11/01/01 11:38 AM                                           
          
                    Please respond to                                           
          
                    IBM NetView                                                 
          
                    Discussion                                                  
          
                                                                                
          
                                                                                
          



Many thanks Leslie.

Your comment sparked an idea because the node was discovered when DNS
was running. When we cleared the databases and started Netview again the
node was discovered without DNS and the colour changed correctly when
the node was halted and booted.

--
Robin
email: robin.james AT thalesatm DOT com
tel:   +44 (0) 1633-862020
fax:   +44 (0) 1633-868313


Leslie Clark wrote:
>
> It is supposed to turn red on the map. You might check to see if you are
> getting any ipmap errors in the nettl log or in $HOME/nv6000.log. The
> ipmap application is one that is automatically restarted if it fails, but
> it
> is not supposed to fail. Sounds like a support issue to me. (If you did
> not have a DNS running on the Netview system when you discovered
> the node, you would not need one now.)
>
> Cordially,
>
> Leslie A. Clark
> IBM Global Services - Systems Mgmt & Networking
> Detroit
>
>
>                     Robin James
>                     <[email protected]       To:     NetView Discussion
<nv-l AT tkg DOT com>
>                     esatm.com>              cc:
>                     Sent by:                Subject:     [NV-L]
Nameserver
>                     owner-nv-l AT tkg DOT co
>                     m
>
>
>                     11/01/01 10:03 AM
>                     Please respond to
>                     IBM NetView
>                     Discussion
>
>
>
> We halted a node and its symbol stayed green on the IP Internet submap
> instead of turning red.
>
> The Topology Database (ovtopodump) showed the correct state, that is the
> node was down.
>
> The trapd log showed no Node Down/Marginal events.
>
> Tracing the netmon process (/usr/OV/bin/netmon -M 63) showed that netmon
> correctly detected when the node was halted. However the submap was
> never updated.
>
> In the Netview Diagnosis Guide it describes the role of the domain
> nameserver (DNS) in map synchronisation. As it happens the DNS process
> was not running on our Netview computer. Is this the reason why the
> symbol did not turn red?
>
> Does Netview require DNS to be available or will it be able to work with
> some other means of mapping the IP address, for example /etc/hosts ?
>
> FYI we're using a dead-end Netview setup - NV 5.1.3 on TRU64 UNIX 5.0F
> :-)
>
> TIA
> --
> Robin
> email: robin.james AT thalesatm DOT com
> tel:   +44 (0) 1633-862020
> fax:   +44 (0) 1633-868313
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