I have 5 Adtran Netvanta 1234 POE swtiches. I have 2 vlans setup. I have noticed network latency increasing in the past week. I am try to track down the cause. I setup a SNMP server to graph the interfaces of the switches to see if any of them have excessive use. (Cacti Server) On the Default vlan, which is used for data only, shows Discards/IN on all the switches. I tracked it down to UnkownProto. How do I find out what devices are creating the traffice that is causing these discards?