I don't really know much about the arp table but was surprised earlier when
Is this to be expected?
If so, what is the most reliable way of being able to tell if that MAC address is active, given that the IP address changes from time to time?
arp -a
did not show a particular MAC address, but I found I could ping the address associated with that MAC address. Is this to be expected?
If so, what is the most reliable way of being able to tell if that MAC address is active, given that the IP address changes from time to time?