PLANET WGSW-52040 - Manual (Page 238)

26.4.3 ARP Troubleshooting
If ping from the switch to directly connected network devices fails, the following can be used to
check the possible cause and create a solution.
 Check whether the corresponding ARP has been learned by the switch.
 If ARP has not been learned, then enabled ARP debugging information and view
the sending/receiving condition of ARP packets.
 Defective cable is a common cause of ARP problems and may disable ARP
learning.
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