[Bug 291100] Reduce ARP cache time from 20 minutes to 60 seconds

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291100

--- Comment #2 from Achilles Gaikwad <[email protected]> ---
(In reply to Marek Zarychta from comment #1)


Thank you for the feedback Marek,

>Perhaps this can be dynamic in dynamic a environment? I don't know if it will be accepted or not, but could you please rework your patch to make this value runtime tunable ?

Yes, as of today, we can change this value using a `sysctl`. 

I also agree, users can configure this themselves in a dynamic environment
where IP addresses can be recycled. With this change I am hoping that we can
provide a better user experience by defaulting to 60s instead of 20m as this
would not affect systems negatively.


```
$ sysctl net.link.ether.inet.max_age
net.link.ether.inet.max_age: 1200
```

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