Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 67
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ServerIron ADX NAT64 Configuration Guide 55
53-1002444-02
High availability for NAT46
4
DRAFT: BROCADE CONFIDENTIAL
The <prefix/subnet> variable specifies the NAT46 IPv4 prefix used by the ServerIron ADX when it
operates as a NAT46 gateway.
The prefetch option directs the ServerIron ADX to prefetch IPv4 to IPv6 mappings from DNS.
NOTE
The nat64 dns-dynamic-learning command must be configured for the prefetch option to take effect.
If dynamic learning is not configured, an error message is displayed.
Configuring NAT46 prefetched dynamic learning
Use the nat64 dns-dynamic-learning command to configure a ServerIron ADX to perform dynamic
learning of IPv4 to IPv6 mappings through DNS.
Enter a command such as the following:
ServerIron ADX(config)# nat64 dns-dynamic-learning
Syntax: [no] nat64 dns-dynamic-learning
With this command configured, a ServerIron ADX will discover IPv6 to IPv4 mappings through DNS
whenever the DNS server receives a new IPv4 destination or IPv6 source.
Once this command is configured, you can configure a ServerIron ADX to prefetch mappings for
IPv4 prefixes using the nat64 ipv4-prefix <prefix/subnet> prefetch command. For more
information, refer to “Configuring NAT46 IPv4 prefixes with prefetched dynamic learning” on
page 54.
Use the clear nat64 dns-dynamic-mapping command to clear all entries created using dynamic
learning. For more information, refer to “Clearing dynamic IPv6-IPv4 mappings” on page 57.
Configuring NAT46 hold-off intervals for DNS discoveries
In advanced configurations, you can configure hold-off intervals for DNS discoveries. By default, a
DNS discovery (or refresh) fails if three retries time out or if the DNS64 server returns an error. In
this situation, the NAT46 gateway can still receive traffic intended for IPv6 resources.
Use the nat64 dns-fail-holdoff command to direct the ServerIron ADX to wait a specified period of
time (in seconds) before retrying a request to the DNS64 server. In the following example, the
hold-off interval is set to 300 seconds:
ServerIron ADX(config)# nat64 dns-fail-holdoff 300
Syntax: [no] nat64 dns-fail-holdoff <holdoff-interval>
The <holdoff-interval> variable is configured in seconds. Configurable values from 10 through
3600 seconds. The default value is 180 seconds.
High availability for NAT46
The only high availability (HA) mode currently supported with the NAT46 feature is 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 15 with the following differences:
- ServerIron ADX 1
- Document History 2
- Contents 3
- About This Document 9
- Command syntax conventions 10
- Notice to the reader 11
- Related publications 11
- Getting technical help 11
- NAT64 and NAT46 Overview 13
- Stateless NAT46 translation 14
- Protocol support 15
- NAT64 fragmentation support 17
- References 18
- Stateful NAT64 Configuration 19
- Operation of stateful NAT64 20
- 53-1002444-02 23
- Enabling connection logging 28
- Displaying NAT64 information 31
- Displaying NAT64 translations 32
- Displaying NAT64 statistics 33
- Displaying NAT64 resources 37
- Stateless NAT64 Configuration 39
- Operation of stateless NAT64 40
- High availability for NAT64 52
- Clearing NAT64 information 53
- Stateless NAT46 Configuration 55
- Operation of stateless NAT46 56
- High availability for NAT46 67
- Displaying NAT46 information 68
- Clearing NAT46 information 69
- Access Control Lists 71
- Rule-based ACLs 72
- Default ACL action 74
- ACL IDs and entries 74
- Configuring rule-based ACLs 77
- Modifying rule-based ACLs 85
- Reordering ACLs 86
- Applying ACLs to interfaces 87
- Adding comments to named ACLs 89
- ACL logging 94
- Displaying ACL log entries 95
- Clearing the ACL statistics 97
- Throttling the fragment rate 98
- DRAFT: BROCADE CONFIDENTIAL 100
- Enabling strict TCP mode 101
- Enabling strict UDP mode 102
- ACLs and ICMP 103
- Numbered ACLs 104
- Named ACLs 105
- • Enable the strict TCP mode 107
- IPv6 Access Control Lists 109
- Configuration notes 110
- Processing of IPv6 ACLs 110
- Configuring IPv6 ACLs 111
- IPv6 ACL syntax 114
- Syntax Description 116
- Displaying IPv6 ACLs 118
- Logging IPv6 ACLs 119
- Network Address Translation 121
- Configuring NAT 122
- Configuring static NAT 123
- Configuring dynamic NAT 123
- Enabling IP NAT 124
- NAT configuration examples 125
- IP NAT with VIP overlap 129
- Translation timeouts 130
- Stateless static IP NAT 132
- IP NAT redundancy 133
- Displaying NAT information 144
- Displaying NAT translation 147
- Displaying VRRPE information 148
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