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• IPv6-to-IPv4 destination address translation. AFT uses the NAT64 prefix to match destination
IPv6 addresses and extracts the embedded IPv4 address from matching IPv6 addresses.
A NAT64 prefix cannot be on the same subnet as any interface on the device.
IVI prefix translation
An IVI prefix is a 32-bit IPv6 address prefix. An IVI address is the IPv6 address that an IPv6 node
uses. As shown in Figure 157, the IVI addre
ss includes an IVI prefix and an IPv4 address.
Figure 157 IVI address format
AFT uses an IVI prefix for IPv6-to-IPv4 source address translation. If a source IPv6 address matches
the IVI prefix, AFT translates it to the embedded IPv4 address.
General prefix translation
A general prefix is an IPv6 address prefix used to construct an IPv6 address representing an IPv4
node in an IPv6 network. The length of a general prefix can be 32, 40, 48, 56, 64, or 96.
As shown in Figure 158, a
general prefix based IPv6 address does not have reserved bits, and an
IPv4 address is embedded as a whole into an IPv6 address.
Figure 158 General prefix based IPv6 address format
AFT uses a general prefix for IPv6-to-IPv4 source and destination address translation. If a source or
destination IPv6 address matches the general prefix, AFT translates it to the embedded IPv4
address.
A general prefix cannot be on the same subnet as any interface on the device.
AFT internal server
AFT internal server maps an IPv4 address and port number to the IPv6 address and port number of
an IPv6 internal server. It allows the IPv6 internal server to provide services to IPv4 hosts.
AFT translation process
The address translation differs for IPv6-initiated communication and IPv4-initiated communication.
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