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Conference turris::digital_unix

Title:DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:Welcome to the Digital UNIX Conference
Moderator:SMURF::DENHAM
Created:Thu Mar 16 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:10068
Total number of notes:35879

9840.0. "atmarp cache timeout" by NNTPD::"[email protected]" (Nancy Flavell) Thu May 15 1997 14:35

Would someone be so kind as to verify whether the kernel values for
arpkillc, arpkilli, arprefresh, and arphold are used to modify the atmarp
cache as well, or is there another way to, say, decrease the value of the
timeout for the atmarp cache entries?  The question pertains to Digital
UNIX 3.2g and 4.0*.

Nancy Flavell
Customer Support Center
[Posted by WWW Notes gateway]
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9840.1Let me trySMURF::PSHPer Hamnqvist, UNIX/ATMThu May 15 1997 20:3628
Hi Nancy -

|Would someone be so kind as to verify whether the kernel values for
|arpkillc, arpkilli, arprefresh, and arphold are used to modify the atmarp
|cache as well, or is there another way to, say, decrease the value of the
|timeout for the atmarp cache entries?  The question pertains to Digital
|UNIX 3.2g and 4.0*.

My expertice is not really in this area of ATM, but let me try to
answer.

If I understand things correctly, there is no such thing as an 'atmarp' 
cache. arp cache management is a central piece of IP and therefore those
values apply. In the event that the arp cache manager requests that a
particular IP address be resolved, the ifnet device with the matching
netmask will be called to "resolve" the request. Different ifnet devices
implement this differently. In the case of ATM CLIP, such a request is
translated into query to the ATMarp server which may or may not be local
to the host. In fact, it would likely be running on the ATM switch. The timers
for managing the ATMarp server repository would be outlined in RFC1577, if
anywhere.

In the case of IP over LANE, its basically like Ethernet. LANE itself knows
nothing of IP. As far as I understand, those values should apply there too.

Cheers,

>Per