Technical data

38 ServerIron ADX NAT64 Configuration Guide

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High availability for NAT46

DRAFT: BROCADE CONFIDENTIAL

If the packets exceed these limitations, one of the following actions will be taken:

1. If the frag-664-reverse-full-sized-pkt command is configured, the packet will be split and no

further actions will be performed.

2. If the condition in step 1 isn’t met, and the DF bit is set at the server, the “frag needed” ICMP

error message will be sent.

3. If the conditions in steps 1 and 2 aren’t met, the packet will be split.

The frag-664-reverse-full-sized-pkt command is configured as shown in the following.

ServerIronADX(config)# frag-664-reverse-full-sized-pkt

Syntax: [no] frag-664-reverse-full-sized-pkt

For more information about NAT64 fragmentation support see “NAT64 fragmentation support” on

page 5.

High availability for NAT46

The only high availability mode currently supported with NAT46 feature is the Active-Active HA.

Support for this mode is essentially the same as for the IPv6 client to IPv6 resource configuration

as described in “High availability for NAT64” on page 17 with the following differences.

• Each ServerIron ADX is configured with a NAT64 IPv6 prefix, specifying the IPv6 address range

and a NAT64 IPv4 prefix, specifying the IPv4 address range.

• Because the NAT46 configuration does not use a port pool, the port pool range option is not

configured.

• Because the NAT46 configuration is stateless, the “inject active only for HA” configuration is

not used.

Displaying NAT46 information

You can display the following information for a NAT46 configuration:

• NAT64 IPv4 to IPv6 address mapping

• In-progress NAT64 DNS dynamic learning

• NAT64 statistics – see “Displaying NAT 64 statistics” on page 20

• NAT64 resources – see “Displaying NAT 64 resources” on page 23

Displaying NAT64 IPv4 to IPv6 address mapping

You can use the show nat64 map command to display NAT64 IPv4 to IPv6 address mappings in a

stateless NAT64 gateway. This output is displayed as follows.

ServerIron ADX# show nat64 map all

*******************************

NAT64 IPv4-IPv6 Address Mapping

IPv4 Address IPv6 Address Type

1.1.1.1 2001::1 CLI

1.1.1.2 2001::2 DNS