topic Maximum ARP entries in HP-UX in Operating System - HP-UX

Maximum ARP entries in HP-UX

U.SivaKumar_2 — Tue, 22 Oct 2002 05:49:41 GMT

Hi,
What is the Maximum number of entries that HP-UX ARP cache can hold ?

regards,
U.SivaKumar

Re: Maximum ARP entries in HP-UX

Clemens van Everdingen — Tue, 22 Oct 2002 05:56:42 GMT

Hi,

I am not sure if there is a max number of entries defined.
I know you can tune this with ndd in nddconf.

example:

#
# Change the amount of time that ARP entries can stay in
# ARP cache to 30 minutes. Default value was 300000
#
TRANSPORT_NAME[0]=arp
NDD_NAME[0]=arp_cleanup_interval
NDD_VALUE[0]=1800000

C.

Re: Maximum ARP entries in HP-UX

U.SivaKumar_2 — Tue, 22 Oct 2002 06:00:37 GMT

Hi Clemens,

Thanks. But I disagree with you . Every OS has
Maximum ARP cache limit . For example windows NT have 62 entries by default. Determined by
registry entry ArpCacheSize .

regards,
U.SivaKumar

Re: Maximum ARP entries in HP-UX

Clemens van Everdingen — Tue, 22 Oct 2002 06:10:09 GMT

Hi,

Ok, clear, I will ask our network expert to see if he knows the figures.

C.

Re: Maximum ARP entries in HP-UX

Clemens van Everdingen — Tue, 22 Oct 2002 06:25:46 GMT

Hi,

Found some info....

The ARP cache is administered as a linked list
of dynamically allocated kernel memory buffers.
The only resource which might limit the size of
the ARP cache is the size of memory available
for the kernel.

But be sure you don't let it grow to big.
This will cause performance problems on looking to much arp entries.

So my first guess was kind of ok :)

C.