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Due to its rapid spread, Internet has now outgrown the address space provided by IPv4. The transition to the new IPv6 protocol is extremely slow. The different transition techniques are intended to facilitate the transition to the new version of Internet Protocol. The NAT64 transition technique is one of the most suitable solutions. In this paper, both the performance and the stability of two NAT64 gateway implementations are examined by ICMP, TCP and UDP protocols. The tested two free implementations, the TAYGA on the Linux system and the PF of the OpenBSD system can be effectively used in a production environment, and can facilitate the deployment of the IPv6 protocol.