Question

how we can communication between ip v-4 and ip v-6

Answer 1

Hello @rprashant,

Translation
Address Family Translation (AFT), or simply translation, facilitates communication between IPv6-only and IPv4-only hosts and networks (whether in a transit, an access, or an edge network) by performing IP header and address translation between the two address families.
AFT is not a long-term support strategy; it is a medium-term coexistence strategy that can be used to facilitate a long-term program of IPv6 transition by both enterprises and ISPs.
Translation offers two major advantages, as discussed in RFC 6144:
• Translation provides a gradual migration to IPv6 by providing seamless Internet experience to greenfiled IPv6-only users, accessing IPv4 Internet services.
• Existing content providers and content enablers can provide services transparently to IPv6 Internet users by using translation technology, with little or no change in the existing network infrastructure, thus maintaining IPv4 business continuity.
Specific protocols such as File Transfer Protocol (FTP) and Session Initiation Protocol (SIP) that embed IP address information within the payload require application-layer gateway (ALG) support for translation.

For more information: : http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/white_paper_c11-676278.html

Hope this has helped!