Nat 6-4; Ipv4 And Ipv6 Address Formats - Brocade Communications Systems 5600 Reference Manual

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FIGURE 6 Bidirectional NAT

NAT 6-4

The Brocade vRouter supports NAT 6-4, a translator that allows IPv6-only networks to communicate

with IPv4-only networks. The router forwards the IPv6 packets to the translator, which converts them

into IPv4 packets. The response IPv4 packets flow in the opposite direction with the NAT6-4 translator

converting IPv4 addresses into IPv6.

The following figure shows the flow of packets, which originate in an IPv6-only network.

FIGURE 7 NAT 6-4 packet flow

To perform NAT 6-4 translation, the router rewrites an incoming IPv6 packet into an IPv4 address space

for the source and destination of the packet. This rewrite requires that the router modify the Ethernet

and the IP headers.

For more information about the IPv4 and IPv6 address formats, refer to RFC 6052 (section 2.2).

Brocade 5600 vRouter NAT Reference Guide

53-1003718-03

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