Sophos UTM/XG: Clear the ARP / Neighbor table

When doing changes on your network, in ex. giving known hosts new IP’s or giving new servers the IP’s of the old ones, there will be a need to reset the ARP table to make sure that traffic can traverse the firewall again, this can be done by reboot’s or but doing a SSH conenction to the firewall and type this in root mode:

“ip -s -s neigh flush all”

On UTM:

Yoiu can also show the ARP entries currently in the system with command “arp -n”

The above command will also work on Sophos XG firewall in the shell, however it has a gui for the same:

Source: Sophos XG Firewall: How to Flush the Neighbor Cache

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