Hello Netview-folks around the planet,
Recently there was a discussion around ARP on this forum.
I would like to add another important point to that,
mainly the broadcast caused by ARP.
We can see with a SNIFFER that big part of our broadcast traffic
within our switched network is caused by our welltuned IBM C10
with Netview5.1.1/Optivity8.1.1 on AIX4.3.2.
I estimate that the ARP-Cache-timeout-value is smaller than values
in the SNMP-tables influnecing the time between two netmon-polls.
Therefore before every Ping to the devices, a ARP-broadcast can be
seen, to learn the MAC-addresses of the SNMP-devices.
And it looks like Optivity is doing it also.
My idea now is to reduce the ARP-broadcast:
Because the boxes that are managed don't change too often, why not
create a permanent ARP-Cache on the Netview-Station to prevent the
sending of ARP-Broadcasts !
Has anybody of You knowledge, how to transform the output from the
command "arp -a" into a file, that can be used again to create permanent
ARP-entries with the command "arp -t iftype -f filename" ?
We use Ethernet and Token-Ring (RIF-info need to be kept)
And second, does anybody know how to influence the ARP-cache-timeout
to change to a value bigger than the netmon-round-trip between two
Ping-checks to the same device ?
Any idea is welcome
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Winfried Gehrig mailto:Winfried.Gehrig@skf.com
SKF GmbH FON ++49(0)9721 56 3077
Gunnar Wester Str. 12 Virtual FAX ++49(0)9721 5663266
97421 Schweinfurt
(Germany)
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