Define different modes for sending replies in response to received ARP requests that resolve local target IP addresses:

• 0 - (default) reply for any local target IP address, configured on any interface
• 1 - reply only if the target IP address is local address configured on the incoming interface
• 2 - reply only if the target IP address is local address configured on the incoming interface and both with the sender's IP address are part from same subnet on this interface
• 3 - do not reply for local addresses configured with scope host, only resolutions for global and link addresses are replied
• 4 - 7 - reserved
• 8 - do not reply for all local addresses

The max value from conf/{all,interface}/arp_ignore is used when ARP request is received on the {interface}.