Nat-Pt Configuration Task List; Protocols And Standards; Configuring Nat-Pt; Configuration Prerequisites - 3Com MSR 50 Series Configuration Manual

Protocols and Standards

NAT-PT Configuration
Task List

Configuring NAT-PT

Configuration
Prerequisites
translated into a valid IPv4 address, the destination IPv6 address is translated into
an IPv4 address. Otherwise, the translation fails.
3 After the source and destination IPv6 addresses of the packet are translated into
IPv4 addresses, the NAT-PT device forwards the packet to an IPv4 host. Meanwhile,
the IPv6-to-IPv4 address mappings are stored in the NAT-PT device.
4 After packets originated from the IPv4 host to the IPv6 host arrive at the NAT-PT,
they swap the source and destination IPv4 addresses according to the stored
mappings to forward the packets to the IPv6 host.
Session initiated by an IPv4 host:
The NAT-PT implementation process for a session initiated by an IPv4 host is as
follows:
1 A packet from an IPv4 host to an IPv6 host reaches the NAT-PT device. The NAT-PT
device translates the source IPv4 address of the packet into an IPv6 address
according to the static or dynamic IPv4-to-IPv6 mappings.
2 The NAT-PT device translates the destination IPv4 address of the packet into an
IPv6 address according to the IPv6-to-IPv4 mapping on the IPv6 network side.
3 After the source and destination IPv4 addresses of the packet are translated into
IPv6 addresses, the NAT-PT device forwards the packet to the IPv6 host.
Meanwhile, the IPv4-to-IPv6 address mapping is stored in the NAT-PT device.
4 After packets originated from the IPv6 host to the IPv4 host arrive at the NAT-PT,
they swap the source and destination IPv6 addresses according to the stored
mapping to forward the response packet to the IPv4 host.
RFC 2765: Stateless IP/ICMP Translation Algorithm
■
RFC 2765: Network Address Translation - Protocol Translation (NAT-PT)
■
To configure the NAT-PT feature, complete the tasks in the following sections:
Task
"Enabling NAT-PT" on page 682
"Configuring a NAT-PT Prefix" on page 682
"Configuring Mappings for IPv4 Hosts Accessing IPv6 Hosts" on page
682
"Configuring Mappings for IPv6 Hosts Accessing IPv4 Hosts" on page
683
"Configuring the NAT-PT Session Timeout Time for Different Protocol
Packets" on page 685
"Configuring the Maximum Number of Sessions" on page 686
"Configuring the ToS/Traffic Class Field in a Packet After NAT-PT" on
page 686
Before implementing NAT-PT, you must enable the IPv6 forwarding function on the
device and configure an IPv4 or IPv6 address as required on the interface that
requires NAT-PT.

NAT-PT Configuration Task List

Remarks
Required
Optional
Required
Required
Optional
Optional
Optional
681