A method of enabling host devices having an IPsec policy to communicate with one another via an IPv6 communication network, which includes the following steps: extracting a Media Access Control identifier (MAC ID) for a target host from a security policy for an IPv6 address for the target host; searching for the MAC ID of the target host in an Address Resolution Protocol (ARP) table on a source host; upon locating the MAC ID of the target host, creating a temporal neighbor cache entry in a neighbor cache table for the target host; and enabling a security association between the source host and the target host based on the temporal neighbor entry in the neighbor cache table, which allows IPv6 communications to be exchanged between the target host and the source host.