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Re: RES: ping response

To: nv-l@lists.tivoli.com
Subject: Re: RES: ping response
From: Rob Napholz <tel1rxn@NJCMAIL.UPS.COM>
Date: Thu, 26 Aug 1999 11:04:15 -0400
What model/s switch and what level of code did you see this problem ?



"Owens, Blaine C" wrote:
>
> AIX answer - "arp -d ipname" will delete the existing arp table entry and
> force a new arp discovery request. You mentioned in a prior note 3Com
> switches. I recall we were having some problems with some 3Com switches some
> time back. I wrote a script to create permanent arp entries for each of
> these and it circumvented the problem. It must've been the level of code in
> the 3Com switches because I no longer have to do this and haven't seen this
> particular problem in some time now.
>
> Blaine Owens
> Eastman Chemical Company
> Phone - (423)-229-3579
> Fax - (423)-229-1188
> bowens@eastman.com
>
> > -----Original Message-----
> > From: Leslie Clark [SMTP:lclark@us.ibm.com]
> > Sent: Thursday, August 26, 1999 10:25 AM
> > To:   NV-L@UCSBVM.ucsb.edu
> > Subject:      Re: RES: ping response
> >
> > Marcos, this sounds reasonable to me, but I'm a software person. If this
> > is what is going on, what should we be doing in Netview to make them come
> > back as quickly as possible?  Status polling is just doing a ping, which
> > is
> > apparently not enough. Force a new-node discovery poll? Is this related
> > to the setting on the server's interface card regarding broadcast? I have
> > recently been instructed by Support to make sure the Token Ring card
> > has the 'confine broadcast to local token-ring' to 'no'.  I have not
> > checked
> > that at the customer I mentioned in my other note who was having a
> > similar problem.
> >
> > Cordially,
> >
> > Leslie A. Clark
> > IBM Global Services - Systems Mgmt & Networking
> >
> >
> >
> > Frantsen
> >
> > This problems happens because when you4ve unpluged this port the entry in
> > the switch ARP-table and Netview ARP-table were refreshed (possible
> > deleted). Netview wasn4t able to translate IP to MAC and consequently
> > wasn4t
> > able to find the machine.
> > When someone ping through another machine at the same segment, it4s
> > generated a ARP broadcast to discovery the MAC, in that moment the switch
> > and Netview make a new entry in your ARP-table. After that they are able
> > to
> > send any IP-packet to this machine.
> >
> > -----Mensagem original-----
> > De: Frantsen Christian [mailto:cf@INTERNOC.SE]
> > Enviada em: Quarta-feira, 25 de Agosto de 1999 06:26
> > Assunto: ping response
> >
> >
> > I noticed something strange the other day when trying some things in our
> > lab.
> >
> > I unplugged a switch by removing the TP-cord and I got a node down in
> > netview (obviously =))
> > then I put the cord back in and I couldn't ping the switch from the
> > netview
> > map, there was no response,
> > I got response from it if I pinged it from a machine right next to me, I
> > tried again from netview, no response then I made a ping from the
> > commandline on the netview-machine. Now i got a
> > response and after that it worked from the map again.
> >
> > Anyone got some feedback on this?
> >
> > -----------------------------------------
> > Christian Frantsen
> > Technical Operations
> >
> > Internoc Scandinavia AB
> > Tel: +46-36-194843
> > Fax: +46-36-194651
> > http://www.internoc.se


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