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linuxcachingarp

arp -d address: Operation not permitted linux

I want to clear the arp cache in Linux, and I have tried to do it with
IP -s -s neigh flush all And also with arp -d <specific IP address>
Both of them does not work...
this is what i get in the terminal..

Solution

  • Check where is your arp binary located:

    $ which arp
/usr/sbin/arp

    The sbin proposes that the binary is intended to be run by superuser. IT touches things that you don't want to give normal users to touch, as described in manual page:

    arp -d address

    will delete a ARP table entry. Root or netadmin priveledge is required to do this. The entry is found by IP address. If a hostname is given, it will be resolved before looking up the entry in the ARP table.

    You need to run it as a root, for example using sudo should work for you:

    sudo arp -d <specific IP address>