Re: Clear ARP cache

[Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>]

Additionally, the LAN/WAN guys are never wrong, clearly you did something
you were not supposed to do.......
Even when you prove LAN/WAN wrong they will insist it's not wrong and you
have to change....

In this case it took IBM to point it out, and suggest the firewall rules
were to blame.  IBM has the bigger stick...

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Tue, Feb 15, 2022 at 1:11 PM Rob Berendt <rob@xxxxxxxxx> wrote:

> Just love it when those network guys run a scan for a period then block
> all ports not used.  Then when you ask to have one turned back on you have
> a long formal process to go through to add it back.
>
> Rob Berendt
> --
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> -----Original Message-----
> From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jim
> Oberholtzer
> Sent: Tuesday, February 15, 2022 2:09 PM
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
> Subject: Re: Clear ARP cache
>
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>
> Thanks Bryan, Larry posted the code I needed as well.
>
> After investigation we found out that the ARP did need to be cleared, but,
> more importantly we found out firewall rules had been applied since the
> last test to "tighten things up" and the rules only allowed the main
> interface address and dropped packets from the other four addresses used by
> this system.  Now I have to wonder what other interesting things will just
> stop working in the future......
>
>
>
> --
> Jim Oberholtzer
> Chief Technical Architect
> Agile Technology Architects
>
>
> On Tue, Feb 15, 2022 at 12:30 PM Bryan Dietz <bdietz400@xxxxxxxxx> wrote:
>
> > I think I posted in the archives, but I have it here:
> >
> > http://bryandietz.us/dsparp.html
> >
> >
> > Bryan
> >
> >
> >
> > Jim Oberholtzer wrote on 2/14/2022 7:30 PM:
> > > Years ago I came across a program to clear the ARP cache on IBM i.  Try
> > as
> > > I might, I can't even find an article on it.  The reason we have to
> clear
> > > the ARP is after one of 5 partitions switch from prod to HA, the other
> > four
> > > partitions ignore DNS and still try to communicate with the prod IP
> > > address, which due the switch has changed.  I cleared the ARP cache
> using
> > > the old iNavigator, but since iNavigator will be going away, and we
> would
> > > like to automate the process, I need a program.
> > >
> > > Anyone have this little gem?
> > >
> > > --
> > > Jim Oberholtzer
> > > Chief Technical Architect
> > > Agile Technology Architects
> > --
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