I currently have a R610 and a R510. The R610 is the master and is hardwired with the R510 setup in a mesh configuration. I did a packet capture today and I noticed that the R610 kept arping for the gateway address. Is this normal activity? or is something not working correctly. Thanks for the help!
Mesh feature will send a unicast ARP (using MAC of GW for destination) every 30 seconds - this is required to verify if the AP is connected via the Ethernet port for automatic MESH mode ... if this ARP fails the AP will switch from Root (RAP) to MESH (MAP) ....
There may be other features in the AP that need to verify wired connectivity ... The AP does this for service state to bring down WLAN's if internet is not reachable, and perhaps also for MASTER auto select. These ARP's may be independent of the MESH mode test.
The AP may also have Proxy ARP enabled - where the AP responds to ARP requests from the network on behalf of the wireless clients - removing this ARP traffic from the RF network.
Check the destination MAC in the ARP requests ... this may help determine what type of ARP is occurring.