From help
BUT - where are this attempts logged???
Hi both,
You can view ARP poisoning attempts in the CLI console with the drop-packet-capture command.
The documentation has been updated: https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Network/Neighbors/ARPNDP/index.html. There's a link to the CLI guide which gives you more information on the drop-packet-capture command.
I hope this helps.
L@DocSupport