Hopefully this would help to all of you that have packet loss or TCP retransmissions, due to the fact that the ARP timeout is an absolute timer and not an activity timer like the MAC Address Table Aging Time.
This is an expected behavior in this type of switches (3750X). When we generate an ARP entry in software, that entry gets programmed into hardware and is not touched again until it is time for a refresh. The refresh happens 1 minute prior to expiration
Therefore, when trying to apply the "ARP timeout" command, be sure to use a timer higher than 1 minute, in order to have, as told before, the 1-minute timer to refresh the ARP table.
Sadly, this is not a bug behavior or something like that, basically, that is how the protocol works.
Anyway, Thanks all for the attention given.
