7.1. Traffic Engineering
7.1. Traffic Engineering
Even if the ISP for end users is different from the PLAT provider (e.g., another ISP), it can implement traffic engineering independently from the PLAT provider. Detailed reasons are below:
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The ISP for end users can figure out the IPv4 destination address from the translated IPv6 packet header, so it can implement traffic engineering based on the IPv4 destination address (e.g., traffic monitoring for each IPv4 destination address, packet filtering for each IPv4 destination address, etc.). The tunneling methods do not have such an advantage, without any deep packet inspection for processing the inner IPv4 packet of the tunnel packet.
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If the ISP for end users can assign an IPv6 prefix greater than /64 to each subscriber, this 464XLAT architecture can separate the IPv6 prefix for native IPv6 packets and the XLAT prefixes for IPv4/IPv6 translation packets. Accordingly, it can identify the type of packets ("native IPv6 packets" and "IPv4/IPv6 translation packets") and implement traffic engineering based on the IPv6 prefix.