In the current phase of the IPv6 transition. it is a typical situation that IPv6 only clients should be enabled to communicate with IPv4 only servers. The DNS64+NAT64 tool suite is an excellent solution to this problem. Although several free software DNS64 implementations exist. https://www.marketingjeunesse.com/product-category/nail-clipper/
Design, Implementation and Performance Estimation of mtd64-ng, a New Tiny DNS64 Proxy
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