Which method can you use to route IPv6 traffic across an IPv4 infrastructure?
6to4 tunneling transports IPv6 packets over an IPv4 network by encapsulating the IPv6 traffic inside IPv4. That makes it a direct technique for carrying IPv6 across IPv4 infrastructure. NAT only translates addresses, L2TPv3 is designed for Layer 2 pseudowires, and dual-stack runs both protocol stacks natively rather than sending IPv6 through IPv4 by tunneling.
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