Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 40
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28 ServerIron ADX NAT64 Configuration Guide
53-1002444-02
Stateless NAT64 overview
3
DRAFT: BROCADE CONFIDENTIAL
The DNS64 server provides the IPv6 client with a synthesized IPv6 address which enables the IPv6
client to reach the IPv4 resource. The synthesized IPv6 address consists of the NAT64 IPv6 prefix
concatenated to the IPv4 destination address of the IPv4 resource and represents that IPv4
resource to the IPv6 network.
The ServerIron ADX is configured as a stateless NAT64 gateway. The NAT64 gateway strips the IPv6
prefix from the synthesized destination address and forwards the packet to the resource using an
IPv4 address obtained from the IPv4-IPv6 mapping table as the source address.
A ServerIron ADX configured for stateless NAT64 translation requires the following components:
• DNS64 server: This component (not supplied by Brocade) is responsible for providing the IPv6
clients with the IPv6 addresses defined for IPv4 resources that the client wants to utilize. The
DNS64 server provides the IPv6 client with a synthesized IPv6 address that enables the client
to reach IPv4 resources. The synthesized IPv6 address consists of the NAT64 IPv6 prefix
concatenated to the IPv4 destination address of the IPv4 resource and represents the IPv4
resource to the IPv6 network.
• NAT64 gateway: This component is installed on a ServerIron ADX. The NAT64 gateway is
reached by the IPv6 client using an IPv6 address supplied to it by the DNS server. A mapping
table translates IPv6 and IPv4 addresses. The mapping table can be populated statically or
dynamically (by way of a real-time DNS query or prefetched DNS query).
• IPv6 prefix: An IPv6 prefix must be configured on the NAT64 gateway. The stateless NAT64
gateway concatenates the IPv6 prefix to the IPv4 source address of the IPv4 resource to create
a synthesized IPv6 address that represents the IPv4 resource to the IPv6 network.
• IPv4-IPv6 mapping table: The mapping table defines a one-to-one relationship between an
IPv4 address and an IPv6 address. This table can be defined manually or generated
dynamically. Dynamically generated mapping tables can be created in real-time or prefetched
from a DNS server. For dynamic mapping, you must configure a DNS server IP address on the
ServerIron ADX.
Operation of stateless NAT64
The following steps describe the operation of stateless NAT64 translation for the environment
shown in Figure 7.
1. In the example shown in Figure 8, the IPv6 client sends a query to the DNS64 server for the
IPv6 address of the resource “www.brocadetest.com”.
2. The DNS64 server responds to the client’s query with a synthesized IPv6 address
(2001:db8:64::192.0.2.1) that represents the IPv4 resource to the IPv6 network. Notice that
this synthesized IPv6 address is composed of a user-configured IPv6 prefix (2001:db8:64::)
and the IP address of the IPv4-only server (192.0.2.1).
- 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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