Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 14
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2 ServerIron ADX NAT64 Configuration Guide
53-1002444-02
NAT64 and NAT46 implementation details
1
DRAFT: BROCADE CONFIDENTIAL
The stateless NAT64 gateway generates an IPv4 source address for the IPv6 host from the
IPv4-IPv6 mapping table. The mapping table can be dynamically constructed using a DNS server or
manually configured. The IPv4 destination address is obtained by stripping away the IPv6 prefix
from the synthesized IPv6 destination address provided by the DNS64 server.
Stateless NAT46 translation
When configured as a stateless NAT46 gateway, the ServerIron ADX enables IPv4-only clients to
communicate with IPv6-only resources using address and packet translation. In a stateless NAT46
configuration, the ServerIron ADX uses a mapping table to match IPv4 request packets sent from
the IPv4 clients with the IPv6 destination address of the IPv6 resource. The mapping table can be
dynamically constructed using a DNS server or manually configured.
NAT46 translation is offered in stateless mode only.
NAT64 and NAT46 implementation details
This section describes the components required for a NAT64 or NAT46 implementation and
provides information that is common to the stateful NAT64 configuration described in Chapter 2,
“Stateful NAT64 Configuration”, the stateless NAT64 configuration described in Chapter 3,
“Stateless NAT64 Configuration”, and the stateless NAT46 configuration described in Chapter 4,
“Stateless NAT46 Configuration”.
NOTE
A ServerIron ADX configured as either a NAT64 gateway or a NAT46 gateway cannot be configured
for other ServerIron ADX features such as SLB, GSLB, TCS, FWLB, and so on. This guide describes
all features that can be enabled on the NAT64 and NAT46 gateway.
Requirements for all NAT64 and NAT46 configurations
The NAT64 mechanism is implemented on a ServerIron ADX that has (at least) two interfaces: an
IPv4 interface connected to the IPv4 network, and an IPv6 interface connected to the IPv6 network.
IPv6 must be enabled on the ServerIron ADX.
Requirements for stateful and stateless NAT64 configurations
The following components are required for stateful and stateless NAT64 gateway configurations:
• The DNS64 resolver provides AAAA responses for any resource that has an IPv4 address but
not an IPv6 address. It generates the IPv6 address for the resource by concatenating a NAT64
prefix to its IPv4 address. When an IPv6 client queries DNS for the address of an IPv4-only
resource, it receives the IPv6 address generated by the DNS64 resolver. Because you can
optionally configure your DNS servers with these IPv6 addresses manually, the DNS64 resolver
is not required.
• The NAT64 gateway receives the IPv6 packet whose destination IPv6 address was generated
by the DNS64 resolver. It then translates the destination IPv6 address to the IPv4 address
owned by the IPv4 resource. The IPv4 packet returned from the IPv4 resource is then mapped
back to the destination IPv6 address from the client's request.
- 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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