I don't get why a machine on the network is asking the gateway for its MAC address when it already knows its MAC address:
So here you can see the machine MAC ***80 (IP ..*.115) asks the gateway (Cisco_87), who has 10.1.10.1 ? In other words, where is the gateway? But it already knows who the gateway is, because it sent the ARP directly to it! I could understand this, if the query was a broadcast, ie, can ANYBODY tell me who the gateway is, but the packet was not broadcast, it was sent directly to the gateway (CISCO_87) and to nobody else, so obviously the machine already knows who the gateway is.