Re: Clear ARP cache

According to the documentation, it only clears the DNS cache, not the ARP table.

The little CLP that Larry posted it what I had in mind.

Jim Oberholtzer
Agile Technology Architects

On Feb 15, 2022, at 6:44 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

Does running CHGTCPDMN also clear this? I thought I heard it does.
CHGTCPDMN aka CFGTCP, 12. Change TCP/IP domain information

https://www.ibm.com/support/pages/dns-query-returning-old-ip-address
https://wiki.midrange.com/index.php/Change_IP_Address#Flushing_DNS_Cache


Rob Berendt
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Larry "DrFranken" Bolhuis
Sent: Monday, February 14, 2022 8:49 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>; Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>
Subject: Re: Clear ARP cache

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Pgm PARM(&LINE)
/* CRTBNDCL PGM(your-lib/CLRARP) +
SRCFILE(your-lib/QCLSRC) +
SRCMBR(CLRARP) */
/* be sure that the PRC retains the upper/lower case */
DCL VAR(&LINE) TYPE(*CHAR) LEN(10)
CALLPRC PRC('QtocRmvARPTblE') PARM(&LINE 0 '*ALL ' +
X'00000000')
end:
endpgm

On 2/14/2022 8:30 PM, Jim Oberholtzer wrote:
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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