Technical data

18 ServerIron ADX NAT64 Configuration Guide

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Displaying NAT64 information

DRAFT: BROCADE CONFIDENTIAL

Forwarding can become asymmetric when there are failovers. For example using the topology

shown in Figure 8 the following could occur:

1. the link from the downstream router to ADX-1 goes down.

2. ADX-1 receives a request from the upstream router which is forwarded to the downstream

router via ADX-2

3. The downstream then forwards the response to the upstream router via ADX-2.

4. The forward and reverse flows hit each of the two ServerIron ADXs which means that the traffic

is asymmetric.

Configuring the port pool range for HA

When Active-Active high availability is configured on a ServerIron ADX you can specify the range of

source ports allocated for the NAT IP for each of the NAT64 gateways configured within the HA

setup, This is enabled by the port-pool-range option of the nat64 pool command. The

port-pool-range option enables NAT64 redundancy. A value of 2 specifies a higher priority of the

NAT IP then a value of 1. A value of 2 also indicates that source ports allocated for the NAT IP are

from the higher range.

The following example configures a NAT64 IPv4 NAT address pool with the port-pool-range option

set to a value of 2.

ServerIron ADX(config) nat64 pool nat64-zone1 201.1.1 201.1.1.20 prefix-length 24

port-pool-range 2

For details about configuring the nat64 pool command, see “Configuring an IPv4 NAT address

pool” on page 11.

Enabling inject active only for HA

This command makes sure that only an active ServerIron ADX will inject the static route and the

standby ServerIron ADX will withdraw the static routes. Without this command (default

configuration) both the active and standby ServerIron ADX will inject the route.

ServerIron ADX(config) nat64 inject-active-only

Syntax: [no] nat64 inject-active-only

NOTE

This command only applies to the IPv6-only client to IPv4 resource configuration as described in this

chapter because it is performed is the stateful mode and maintains session relationships.

Displaying NAT64 information

You can display the following information for a NAT64 configuration:

• Session information

• NAT64 translations

• NAT64 statistics

• NAT64 resources