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  3. February 2022

Re: Clear ARP cache

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
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 7310 Innovation Blvd, Suite 104
Ft. Wayne, IN 46818
Ship to: 7310 Innovation Blvd, Dock 9C
Ft. Wayne, IN 46818
http://www.dekko.com

-----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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