29 lines
1.4 KiB
Markdown
29 lines
1.4 KiB
Markdown
The `ip64` module lets an IPv6 Contiki network be connected to an IPv4
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network without any additional configuration or outside software. The
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`ip64` module runs on the RPL root node and translates outgoing IPv6
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packets into IPv4 packets nd incoming IPv4 packets to IPv6 packets.
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The `ip64` module uses stateful NAT64 (RFC6164) to do the packet
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translation and DNS64 (RFC6147) to catch DNS requests for IPv6
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addresses, turn them into requests for IPv4 addresses, and turn the
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replies into responses for IPv6 addresses. This allows devices on the
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inside IPv6 network to connect to named servers on the outside IPv4
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network.
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The `ip64` module hooks into the IPv6 stack via a fallback
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interface. Any packet that can not be routed into the local RPL mesh
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will be sent over the fallback interface, where `ip64` picks it up,
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translates it into an IPv4 packet, and sends it over its outgoing
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interface.
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In addition to providing NAT64 and DNS64 services, the `ip64` module
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also performs DHCPv4 to request IPv4 address for devices connected to
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a medium such as Ethernet. The `ip64` module also performs ARP
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processing to communicate over the Ethernet.
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The `ip64` module uses a configuration file called `ip64-conf.h` that
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specifies what device to use for the IPv4 network. This file is
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intended to be placed in the platform directory. An example
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configuration file called `ip64-conf-example.h` is provided in this
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directory.
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