SUMMARY: arp cache size and time-out

From: Mark 'Hex' Hershberger (
Date: Fri Oct 31 1997 - 23:42:29 CST

I got only one response to my query. It was from Audrey Taylor

Here is my original:

I need some info on the arp cache size for Solaris 2.5 (or a pointer
to where this information can be found). Specifically:

        What is the default size of the cache?

        What is the default time-out for entries in the cache?

        How can these two parameters be read?

        How can we change these parameters?

Thanks. Will summarize.

And Audrey's reply:

An ARP entry that is not completeed within 5 minutes is removed, and
entries not in use are flushed every 20 minutes. TThe variables
ip_ire_cleanup_variable and ip_ire_flush_variable determine these
values ( in /dev/ip ). Use ndd to view or chnage these values e.g. ndd
-set /dev/ip ip_ire_flush_interval <n>.

You can also view the arp cache from /dev/arp using ndd:-

ndd -get /dev/ip arp_cache_report


That seemed to work, but can anyone tell me what the numbers are in
units of? (Man page reads: "The meanings of many ndd parameters make
sense only if you understand how the driver is implemented.")


                           _o                     )
 Mark `Hex' Hershberger   `\<   New Orleans, LA  (
                        (*)/(*)                 c[]

Accustomed to the veneer of noise, to the shibboleths of promotion, public relations, and market research, society is suspicious of those who value silence. -John Lahr

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