Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 13
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ServerIron ADX NAT64 Configuration Guide 1
53-1002444-02
DRAFT: BROCADE CONFIDENTIAL
Chapter
1
NAT64 and NAT46 Overview
In this chapter
•Overview of NAT64 and NAT46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
•NAT64 and NAT46 implementation details . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Overview of NAT64 and NAT46
The industry faces a challenging transition while it moves from its current IPv4-capable routers,
switches, servers, and applications to IPv6-ready devices. Service providers—whether they are
providing content, hosting services, or Internet access—cannot add or accommodate new
customers unless their content is equally accessible to both IPv4 and IPv6 users.
The ServerIron ADX supports both current IPv4 customers and offers a seamless experience to
users that access IPv4 Internet services through new IPv6-only networks in three simple and cost
effective ways: stateful NAT64 gateway, stateless NAT64 gateway, and a stateless NAT46 gateway.
Stateful NAT64 translation
NAT64 capabilities of Brocade ServerIron ADX enable organizations to bring new IPv6 customers
onboard while utilizing their existing IPv4-based infrastructures.
In a stateful NAT64 configuration, a ServerIron ADX configured as a NAT64 gateway enables
IPv6-only clients to communicate with IPv4 resources by way of address and packet translation.
This translation operation is performed on the NAT64 gateway using stateful sessions.
NAT64 is transparent to end users, meaning that IPv6-only clients can access IPv4 resources
seamlessly. NAT64 translation does not require any change on CPE devices at the client end.
NAT64 requires the IPv6 client address be replaced by an IPv4 address while communicating
with the IPv4 network and resources. IPv4 addresses are configured on the ServerIron ADX.
Stateful NAT64 maps multiple IPv6 clients to each of these IPv4 addresses using a technique
similar to NAT-PT. The translation operation requires knowledge of the IPv6-IPv4 address and
port mapping and this is maintained using stateful sessions.
Stateless NAT64 translation
Stateless NAT64 enables IPv6-only clients to communicate with IPv4-only hosts similar to stateful
NAT64. However, unlike stateful NAT64, it requires a one-to-one mapping between the IPv6 and the
IPv4 address of clients. In effect, stateless NAT64 does not require the creation of flow sessions
because an IPv4 address is allocated for each IPv6 address and there is no dynamic mapping of
IPv4 addresses to IPv6 addresses.
- 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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