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other:
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All nodes now enable ``arp_accept`` sysctl setting to help with honoring
gratuitous ARP packets in their ARP tables. While sources of gratuitous ARP
packets are diverse, this comes especially useful for Neutron floating IP
addresses that roam between devices, and for which Neutron L3 agent sends
gratuitous ARP packets to update all network nodes about IP address new
locations.
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