R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

212
Ste
p
Command Remarks
2. Configure an IVI
prefix.
aft prefix-ivi ivi-prefix
No IVI prefix is configured by default.
The DNS64 prefix cannot be the same as the IVI
prefix.
Repeat this command to configure multiple IVI
prefixes.
Configuring a 6to4 AFT policy
When the communication is initiated by an IPv6 host and the address of the IPv6 host is not an IVI
address, the AFT translates the IPv6 address into an IPv4 address based on the 6to4 ATF policy. The
detailed process is described as follows:
If the source IPv6 address of the packet matches the specified IPv6 ACL or the destination IPv6 address
prefix is the same as the specified DNS64 prefix, the AFT translates the source IPv6 address into an IPv4
address in the IPv4 address pool or the IPv4 address of an interface. For more information about ACLs,
see ACL and QoS Configuration Guide.
The AFT supports the following types of 6to4 AFT policy:
• Type 1—Associate an IPv6 ACL with an address pool
If the source IPv6 address matches the IPv6 ACL, the address is translated into an IPv4 address in
the address pool associated with the IPv6 ACL. If the no-pat keyword is specified, only the IP
address is translated. If not, both the IP address and the port number are translated to save the IPv4
addresses in the address pool.
• Type 2—Associate an IPv6 ACL with an interface address
If the source IPv6 address matches the IPv6 ACL, the AFT translates the address into the IPv4
address of the interface associated with the IPv6 ACL. The port number is also translated.
• Type 3—Associate a DNS64 prefix with an address pool
If the prefix of the destination IPv6 address is the DNS64 prefix specified in the policy, the source
address is translated into an IPv4 address in the address pool associated with the DNS64 prefix.
If the no-pat keyword is specified, only the IP address is translated. Otherwise, both the IP address
and the port number are translated to save the IPv4 addresses in the address pool.
• Type 4—Associate a DNS64 prefix with an interface address
If the prefix of the destination IPv6 address is the DNS64 prefix specified in the policy, AFT
translates the source address into the IPv4 address of the interface associated with the DNS64
prefix. The port number is also translated.
The AFT address pool contains a range of continuous IPv4 addresses. When the AFT policy is type 1 or
type 3, the AFT chooses an IPv4 address from the address pool as the translated IPv4 address.
Configure the DNS64 prefix by using the aft prefix-dns64 command.
To configure the 6to4 AFT policy:
Step Command Remarks
1. Enter system view.
system-view N/A