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44 ServerIron ADX NAT64 Configuration Guide
53-1002444-02
Stateless NAT46 overview
4
DRAFT: BROCADE CONFIDENTIAL
The ServerIron ADX is configured as a stateless NAT46 gateway. For an IPv4 host, the NAT46
gateway generates the IPv6 source address by concatenating the IPv6 prefix to the IPv4 source
address. The IPv6 destination address is obtained from the IPv4-IPv6 mapping table using the IPv4
destination address.
Two key components must be configured on the NAT46 gateway for it to enable communication
between IPv4 clients and IPv6 resources.
• IPv6 prefix: The stateless NAT46 gateway is also configured with an IPv6 prefix that it
concatenates to an IPv4 source address to create an IPv6 source address on the NAT46
gateway for each of the IPv4 clients to the IPv6 resources. The IPv6 prefix defined on this
NAT46 gateway is 2001:db8:64::/96.
• 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.
Operation of stateless NAT46
The following steps describe the operation of stateless NAT46 translation for the environment
shown in Figure 12.
1. In the example shown in Figure 13, the IPv4 client sends a query to the DNS server for the IPv4
address of the resource “www.brocadetest.com” and the DNS server responds with the IPv4
address (200.1.1.1).
The DNS server is configured to respond to a query from the IPv4 client with an IPv4 address.
FIGURE 13 IPv4 client to DNS server communication
2. The request packet is then sent to the NAT46 gateway using the IPv4 address (200.1.1.1) that
was obtained from the DNS server for “brocadetest.com” as the destination IP (DIP) address.
3. The NAT46 gateway uses its mapping table to translate the IPv4 DIP (200.1.1.1) into the IPv6
address (2001:db8:80::80) of the IPv6 server that hosts “brocadetest.com”.
The mapping table used for this translation can be populated statically or dynamically (by way
of a real-time DNS query or prefetched DNS query). For more information, refer to “Populating
the NAT46 mapping table” on page 45.
4. The NAT46 gateway creates a synthesized IPv6 source IP (SIP) address for the packet by
concatenating the IPv6 prefix to the IPv4 address of the IPv6 resource.
In this example, the IPv6 prefix (2001:db8:64::) is combined with the IPv4 address (192.0.2.1)
to create the IPv6 source address (2001:db8:64::192.0.2.1) for the packet forwarded to the
IPv6 resource.
DNS Server
IPv4 Client
IPv4
www.brocadetest.com
200.1.1.1
- 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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