I have replaced a cisco router with a Vyos router.
The old cisco had an arp age timeout of something long like 4 hours.
On Vyos it appears to be 60 secs, which appears to be a linux standard.
This causes all sorts of problems with monitoring devices on my network thinking they are unreachable.
We monitor hundreds of switches, routers, access points, etc… with Nagios and this is causing tons of unreachable issues.
Is there a way to have the router hold the entries for more like 30 minutes to 1 hour versus dropping off every 60 secs?
Are there any ramifications of editing the sysctl.conf file and increasing the default gc_stale_time?
net.ipv4.neigh.default.gc_stale_time = 1800
Any help would be appreciated.