Hello,
Three main options are available for migration to IPv6 from the existing network infrastructure: dual-stack network, tunneling, and translation. The following document briefly discusses each of these options and highlights the advantages of translation and, in particular, stateful translation, over the other two. It provides a technical overview of the translation scenarios documented in RFC 6144
http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6-solution/white_paper_c11-676278.html
Manish
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