Arp table

N

nulkarp

I wonder how much time arp table refresh?

I want to save records of Arp

For this, I need to know the time of renewal.

____________________________________________________
Sorry for my bad english.
 
arp(4)

Code: 
MIB Variables
     The ARP protocol implements a number of configrable variables in
     net.link.ether.inet branch of the sysctl(3) MIB.

     max_age       How long an ARP entry is held in the cache until it needs
                   to be refreshed.

Code: 
$ sysctl -n net.link.ether.inet.max_age
1200

I know of no direct way to query a specific arp entry for 'how old it is', and I gather that each arp entry lives at most 20 minutes (1200 seconds) before it needs to be refreshed. So running a cron job that saves records (arp -a) every ~20 minutes may work.
 
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