How can I monitor ARP?

ARP (Address Resolution Protocol) maps layer 3 (IP addresses) to layer 2 (physical or MAC addresses) to enable communications between hosts residing on the same subnet. ARP is a broadcast protocol that can create excessive amounts of network traffic on your network. To minimize the broadcast traffic, an ARP cache is maintained to store and reuse previously learned ARP information.

L2 loops, ARP floods, 802.1q mismatch, subnet mask mismatch, etc. 

NOTE: Admin would need to enable different features like AppFlow Monitor or MAC-IP Anti-Spoof.

1. MONITOR | Real-Time Charts | Protocol Monitor | ARP RATE
   
   
   
2. NETWORK | System | ARP | ARP Cache | Statistics
   
   
   
3. NETWORK | System/MAC IP Anti-spoof | Anti-spoof Cache | Statistics
   
   
   
4. NETWORK | System/MAC IP Anti-spoof | Spoof Detected List
   
   
   
5. MONITOR | Logs | System Logs  and Filter by keyword "ARP"
   
   
   
6. MONITOR | Tools & Monitors | Core0 Processes, and search for arp tasks usage
   
   
   
7. Using the Packet Monitor follow the link Diagnose your network topology with SonicWall built-in Packet Monitor (layer 2 loops)