Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 15
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ServerIron ADX NAT64 Configuration Guide 3
53-1002444-02
NAT64 and NAT46 implementation details
1
DRAFT: BROCADE CONFIDENTIAL
Requirements for stateless NAT46 configurations
The ServerIron ADX must be configured as a NAT46 gateway. The NAT46 gateway receives IPv4
packets whose destination IPv4 address is mapped to an internal IPv6 resource. It then translates
the IPv4 address to an IPv6 address using the IPv4-IPv6 mapping table information. Return
packets from the IPv6 resource are then mapped back to the client’s IPv4 address. NAT46 is
stateless, meaning that the NAT46 device does not keep track of the connections between the IPv4
client and the IPv6 resource.
Protocol support
The Foundry implementation of NAT64 and NAT46 supports the following protocols:
• Generic Transmission Control Protocol (TCP)
• Generic User Datagram Protocol (UDP)
• Hypertext Transfer Protocol (HTTP)
• HTTP Secure (HTTPS)
• Internet Control Message Protocol (ICMP)
• Remote Desktop Protocol (RDP)
NOTE
TFTP is not supported with NAT64.
NAT64 ICMPv6 to ICMPv4 message handling
NAT64 ICMP packet handling allows ICMPv6 messages to be translated to the corresponding
ICMPv4 messages on the IPv4 side, and ICMPv4 messages from the IPv4 side to be translated to
the corresponding ICMPv6 messages on the IPv6 side.
Table 1 shows how ICMPv6 messages are translated to ICMPv4 messages.
TABLE 1 ICMPv6 to ICMPv4 message translation
ICMPv6 message type ICMPv4 message type
Destination Unreachable (Type 1) Destination Unreachable (Type 3)
no route to destination (code 0) destination host unreachable (code 1)
communication with destination
administratively prohibited (code 1)
host administratively prohibited (code 10)
beyond scope of source address (code
2)
source route failed (code 5)
address unreachable (code 3) destination host unreachable (code 1)
port unreachable (code 4) destination port unreachable (code 3)
Packet Too Big (Type 2) Destination Unreachable (Type 3)
fragmentation required, and DF flag set (code
4)
- 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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