 | 1 | initial version |
To send a unicast (non-broadcast) packet over an Ethernet network requires the host to know the MAC address of the next hop and this is achieved with an ARP request.
If there is a host at the target address it will respond, providing its MAC address for the sending host to use.
If there is no host at the target address, there will not be an ARP response and the UDP packet will not be sent.
