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38 ServerIron ADX NAT64 Configuration Guide
53-1002444-02
Stateless NAT64 dynamic mapping configuration
3
DRAFT: BROCADE CONFIDENTIAL
Configuring NAT64 hold-off intervals for DNS discoveries
By default, a DNS discovery (or refresh) fails if three retries time out or if the DNS server returns an
error. In this situation, the NAT64 gateway can still receive traffic intended for IPv4 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 DNS 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 are from 10 through
3600 seconds. The default value is 180 seconds.
NAT64 prefetched dynamic mapping configuration
The NAT64 gateway can be configured prefetched dynamic mappings—to periodically send PTR
queries to the DNS server to determine the IPv4 address translations for the IPv6 destination
addresses specified. The NAT64 gateway uses this information to populate its mapping table.
The tasks required to configure a ServerIron ADX for NAT64 translation using mapping tables that
are dynamically generated using prefetched queries include the following:
• “Configuring NAT64 IPv6 prefixes with prefetched dynamic learning” on page 38
• “Configuring NAT64 IPv4 prefixes with prefetched dynamic learning” on page 38
• “Configuring NAT64 prefetched dynamic learning” on page 39
Advanced configuration tasks include “Configuring NAT64 hold-off intervals for DNS discoveries”
on page 39.
Configuring NAT64 IPv6 prefixes with prefetched dynamic learning
The NAT64 gateway uses a NAT64 IPv6 prefix to create a synthesized IPv6 address to represent
IPv4 resources to the IPv6 network.
Enter a command such as the following:
ServerIron ADX(config)# nat64 ipv6-prefix 2001:db8:8000::0/96 stateless
Syntax: [no] nat64 ipv6-prefix <prefix/subnet> stateless
The <prefix/subnet> variable specifies the IPv4 prefix that will be used by the ServerIron ADX when
operating as a NAT64 gateway.
The stateless operand is required for stateless NAT64 gateway configurations. Only one IPv6 prefix
can be designated as stateless using this option.
Configuring NAT64 IPv4 prefixes with prefetched dynamic learning
In a NAT64 configuration, the IPv4 prefix defines the range of IPv4 addresses that can be used to
represent the IPv4 resources to the IPv6 network.
- 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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