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linktree Topic: ARP Cache Timeout
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Topic: ARP Cache Timeout  (Read 3368 times)
« on: July 26, 2007, 18:00:00 »
Greg *
Posts: 12
Hi All,

I am configuring a two m0n0walls as end points to a backhaul link between two buildings.  I need to know the ARP Cache Timeout for the m0n0walls to complete the configuration.  Is it possible to query the m0n0wall and determine what the value is?  Is it possible to change the ARP Cache Timeout value?

Thanks!  Greg
« Reply #1 on: July 26, 2007, 20:07:03 »
Greg *
Posts: 12
I did some additional digging off the m0n0wall site and believe I have found the answer.  I will post the answer here in case it is of interest to others.

The ARP Cache Timeout value is a sysctl variable under FreeBSD.  You can see it (along with many other variables) by issuing the following command from exec.php (the m0n0wall command line web page):

     sysctl -a

The specific variable of interest is net.link.ether.inet.max_age which is the ARP Cache Timeout value for the system.  The 1.231 version of m0n0wall has this value set to 1200 seconds or 20 minutes.  This value can be changed with:

     sysctl -w net.link.ether.inet.max_age=<timeout_in_seconds>

I hope others find this useful, Greg
 
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