For Ipv4-Initiated Communication - HP FlexNetwork MSR2003 Configuration Manual

Figure 158 AFT process for IPv6-imitated communication
IPv6 addr: 3000:0:ff02:202:200::/48
Embedded IPv4 addr: 2.2.2.2/8
IPv6 host

For IPv4-initiated communication

As shown in
follows:
1. Upon receiving a packet from the IPv4 host, AFT compares the packet with IPv4-to-IPv6
destination address translation policies.
If a matching policy is found, AFT translates the destination IPv4 address according to the
policy.
If no matching policy is found, AFT does not perform address translation.
2. AFT performs the pre-lookup to determine output interface for the translated packet. PBR is not
used for the pre-lookup.
If a matching route is found, the process goes to step 3.
If no matching route is found, the router discards the packet.
3. AFT compares the source IPv4 address with IPv4-to-IPv6 source address translation policies.
If a matching policy is found, AFT translates the source IPv4 address according to the
policy.
If no matching policy is found, AFT discards the packet.
4. AFT forwards the translated packet and records the mapping between IPv4 addresses and
IPv6 addresses.
5. AFT translates the IPv6 addresses in the response packet header to IPv4 addresses based on
the address mappings before packet forwarding.
For more information about IPv4-to-IPv6 destination address translation policies, see
an IPv4-to-IPv6 destination address translation
For more information about IPv4-to-IPv6 source address translation policies, see
IPv4-to-IPv6 source address translation
NAT64 prefix: 2000::/32
IVI prefix: 3000::/32
Dst: 2000:0:101:101::
Src: 3000:0:ff02:202:200::
Translates addresses based on
the NAT64 prefix, IVI prefix, or
v6tov4 AFT policy
Translates addresses based on
the recorded mappings
Dst: 3000:0:ff02:202:200::
Src: 2000:0:101:101::
Figure 159, when the IPv4 host initiates the access to the IPv6 host, AFT operates as
IPv4 addr: 1.1.1.1/8
Translated IPv6 addr: 2000:0:101:101::/40
AFT
Dst: 1.1.1.1
Src: 2.2.2.2
Dst: 2.2.2.2
Src: 1.1.1.1
policy".
policy".
432
IPv4 host
"Configuring
"Configuring an