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Flushing the ARP Cache
10/14/2021 
67 People found this article helpful
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Description
This article explains how to flusht he ARP cache of a firewall
Resolution
Resolution for SonicOS 6.5
This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.
It is sometimes necessary to flush the ARP cache if the IP address has changed for a
device on the network. Since the IP address is linked to a physical address,
the IP address can change but still be associated with the physical address in the ARP cache.
Flushing the ARP Cache allows new information to be gathered and stored in the ARP Cache.
Navigate to Manage tab at the top of the page
Navigate to Network | ARP
Select Flush ARP Cache to clear the ARP table
To configure a specific length of time for the entry to time out, enter a value in minutes in the ARP Cache entry time out (minutes) field.
Resolution for SonicOS 6.2 and Below
The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.
It is sometimes necessary to flush the ARP cache if the IP address has changed for a
device on the network. Since the IP address is linked to a physical address,
the IP address can change but still be associated with the physical address in the ARP cache.
Flushing the ARP Cache allows new information to be gathered and stored in the ARP Cache.
Navigate to Network > ARP > Click Flush ARP Cache to clear the information.
To configure a specific length of time for the entry to time out, enter a value in minutes in the ARP Cache entry time out (minutes) field.
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Categories
- Firewalls > SonicWall NSA Series > Networking
- Firewalls > SonicWall SuperMassive 9000 Series > Networking
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