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Providing FTP service from an IPv4 network to the IPv6
Internet
Network requirements
As shown in Figure 164, a company deploys an IPv4 network, and it has an IPv6 address 2012::1.
The Internet migrates to IPv6.
To allow the IPv4 FTP server to provide FTP services to IPv6 hosts, configure the following AFT
policies on the router:
• Configure an IPv4-to-IPv6 source address static mapping for the IPv4 FTP server. The router
uses the mapping to translate the destination IPv6 address of IPv6-initiated addresses to the
IPv4 address.
• Configure an IPv6-to-IPv4 source address dynamic translation policy. The router translates
source IPv6 addresses of IPv6-initiated packets to source IPv4 addresses 30.1.1.1 and
30.1.1.2.
Figure 164 Network diagram
Configuration procedure
# Specify IP addresses for the interfaces on the router. (Details not shown.)
# Map source IPv4 address 20.1.1.1 to source IPv6 address 2012::1.
<Router> system-view
[Router] aft v4tov6 source 20.1.1.1 2012::1
# Configure address group 0, and add the address range from 30.1.1.1 to 30.1.1.2 to the group.
[Router] aft address-group 0
[Router-aft-address-group-0] address 30.1.1.1 30.1.1.2
[Router-aft-address-group-0] quit
# Configure IPv6 ACL 2000 to permit all IPv6 packets to pass through.
[Router] acl ipv6 basic 2000
[Router-acl6-basic-2000] rule permit
[Router-acl6-basic-2000] quit
# Configure the router to translate source addresses of IPv6 packets permitted by IPv6 ACL 2000 to
IPv4 addresses in address group 0.
[Router] aft v6tov4 source acl ipv6 number 2000 address-group 0
# Enable AFT on GigabitEthernet 2/0/1, which is connected to the IPv6 Internet.
[Router] interface gigabitethernet 2/0/1
[Router-GigabitEthernet2/0/1] aft enable
[Router-GigabitEthernet2/0/1] quit
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