Known as ARP flux, this can lead to the possibly puzzling effect that an IP migrates non-deterministically through multiple link layer addresses. On the machine creating the ARP request, these multiple answers can cause confusion, or worse yet, non-deterministic population of the ARP cache. The machine may respond to ARP requests from both Ethernet interfaces. When a linux box is connected to a network segment with multiple network cards, a potential problem with the link layer address to IP address mapping can occur. If these devices have multiple network interfaces which have an IP address in the same subnet, then it is possible that your are suffering from ARP Flux:
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