9.5. Multiple connections to the same Ethernet

Assume a machine has multiple connections to the same Ethernet segment, and has individual IPs bound to each interface. A peculiar feature of linux is its willingness to respond to ARP requests for any IP bound to any interface. This can lead to ARP flux, a situation where a given IP is sometimes accessed on one MAC address and sometimes another.

/proc/sys/net/ipv4/conf/all/hidden; consider arp suppression issues.