HPE FlexNetwork MSR Series Comware 7 Layer 3 - Ip Services Configuration Guides

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IPv6-initiated communication
As shown in Figure 159, when the IPv6 host initiates access to the IPv4 host, AFT operates as
follows:
1. Upon receiving a packet from the IPv6 host, AFT compares the packet with IPv6-to-IPv4
destination address translation policies.
{ If a matching policy is found, AFT translates the destination IPv6 address according to the
policy.
{ If no matching policy is found, AFT does not process the packet.
2. AFT performs pre-lookup to determine the 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, AFT discards the packet.
3. AFT compares the source IPv6 address of the packet with IPv6-to-IPv4 source address
translation policies.
{ If a matching policy is found, AFT translates the source IPv6 address according to the
policy.
{ If no matching policy is found, AFT discards the packet.
4. AFT forwards the translated packet and records the mappings between IPv6 addresses and
IPv4 addresses.
5. AFT translates the IPv4 addresses in the response packet header to IPv6 addresses based on
the address mappings before packet forwarding.
For more information about IPv6-to-IPv4 destination address translation policies, see "Configuring
an IPv6-to-IPv4 destinatio
n address translation policy."
For more information about IPv6-to-IPv4 source address translation policies, see "Configuring an
IPv6-to-IPv4 sou
rce address translation policy."
Figure 159 AFT process for IPv6-initiated communication
IPv6 host IPv4 hostAFT
Dst: 2000:0:101:101::
Src: 3000:0:ff02:202:200::
IPv6 addr: 3000:0:ff02:202:200::/48
Embedded IPv4 addr: 2.2.2.2/8
IPv4 addr: 1.1.1.1/8
Translated IPv6 addr: 2000:0:101:101::/40
NAT64 prefix: 2000::/32
IVI prefix: 3000::/32
Dst: 1.1.1.1
Src: 2.2.2.2
Dst: 2.2.2.2
Src: 1.1.1.1
Dst: 3000:0:ff02:202:200::
Src: 2000:0:101:101::
Translates addresses based on
the NAT64 prefix, IVI prefix, or
v6tov4 AFT policy
Translates addresses based on
the recorded mappings

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English