Saturday, September 21, 2013

Palo Alto: How To Clear The ARP Cache

How do you clear the ARP cache?  This is not too hard.  Just SSH into the Palo Alto box.  Then run the command:

skillen@PA-3020> clear arp all

All ARP entries are cleared.


  1. Does this have any negative impact on the firewall active sessions as we do this on active firewall or is it recommended to clear arp all on secondary node > Failover > clear arp all on primary node in an active/passive ?

    1. No, ARP table is replicated over to the passive unit.

    2. When upgrading to 7.1, clear arp is recommended before upgrade. Do we do it right before install on the passive unit ? Or is it done on both units once before beginning the whole process ?


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