Clear ARP / Neighbour cache on Linux

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I am trying to diagnose why out-of-scope ARP requests are being sent (ARP requests for addresses that should be on the default gateway). I thought I had figured it out, but my ARP table was still full of 100’s of incomplete entries. “arp -d” just marks an entry as incomplete, so does “ip neigh del“. I wanted to flush the entire cache.

What finally worked was to flip ARP on/off.

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