If it not supported for your version of ip, simply remove them from the command.
Depending on your distribution, the Automate security audits with Lynis and Lynis Enterprise This blog post is part of our Linux security series to get Linux (and Unix-based) systems more secure.
The IP/MAC address mapping information so obtained is cached in local ARP table, so that ARP query process can be omitted subsequently.Problems can arise when for whatever reason, host X does not receive ARP replies for a destination host Y with which it wishes to communicate.In other cases, ARP replies come in, but contain a MAC address associated with an incorrect host Z. But although I set this to 30000ms (30sec) it still takes close to 10mins for an entry to get removed from the ARP cache.After reading few articles I see there are few more settings that affect the timeout: The neighbor cache in the Linux kernel isn't as simple as one would think. There are subtle differences between an neighbor cache entry actually falling out of the cache entirely or just being marked as stale/invalid.