配置静态IPV6 NAT-PT

一.概述：

IPV6 NAT-PT( Network Address Translation - Port Translation)应用与ipv4和ipv6网络互访的情况，根据参考链接配置时出现一些问题，所以记录下来。

参考链接：

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a0080b9a911.shtml

---配置有些小错误：ipv4接口没有敲ipv6 enable；ipv6接口没有敲ipv6 nat

http://blog.sina.com.cn/s/blog_5ec353710101e8mb.html

---配置有些小错误：ipv4接口没有敲ipv6 enable；并测试时发现单向通不了

二.基本思路：

A.测试环境：

GNS,Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9-M), Version 12.4(24)T7, RELEASE SOFTWARE (fc2)

B.IPV4访问IPV6网络时，将IPV4地址转换成带IPV6 NAT前缀的地址

 IPV6访问IPV4网络，使用IPV4转换后的IPV6地址访问。

C.测试发现处于IPV4和IPV6的双栈路由器，IPV4的接口需要配置ipv6 nat和ipv6 enable

D.测试环境ip cef和ipv6 cef对NAT转换有时有影响，有时没有影响

E.不知是否是IOS的问题，只配置v6v4的NAT，通不了，路由器不会自动根据nat前缀将IPV4的地址转成IPV6的地址

F.经过测试，双栈路由器配置IPV6地址的接口可以不用配置Iipv6 enable，而只配置IPV4地址的接口需要敲ipv6 enable

G.动态NAT-PT，V6可以主动访问V4（使用V4地址池），还是V4可以主动访问V6（使用V6地址池），跟动态NAT类似，每次都需要占用一个地址，而不能像PAT那样

三.测试拓扑：

四.配置步骤：

A.R1：

interface FastEthernet0/0
    ip address 192.168.30.1 255.255.255.0
    no shut
!
ip route 0.0.0.0 0.0.0.0 192.168.30.2

B.R2:

interface FastEthernet0/0
    ip address 192.168.30.2 255.255.255.0
    ipv6 enable
    ipv6 nat
!
interface FastEthernet0/1
    ipv6 address 2001:DB8:3002::2/64
    ipv6 nat
!        
ipv6 route ::/0 2001:DB8:3002::3
ipv6 nat v4v6 source 192.168.30.1 2000::C0A8:1E01
ipv6 nat v6v4 source 3001:11:0:1::1 150.11.3.1
ipv6 nat prefix 2000::/96

C.R3:

interface Loopback0
    ipv6 address 3001:11:0:1::1/64
!
interface FastEthernet0/0
    ipv6 address 2001:DB8:3002::3/64
!
ipv6 route ::/0 2001:DB8:3002::2

五.测试：

R1#ping 150.11.3.1    

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.11.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 60/87/168 ms
R1#

R3#debug ipv6 icmp
 ICMP Packet debugging is on
R3#
*Dec 28 17:24:06.699: ICMPv6: Received echo request, Src=2000::C0A8:1E01, Dst=3001:11:0:1::1
*Dec 28 17:24:06.703: ICMPv6: Sent echo reply, Src=3001:11:0:1::1, Dst=2000::C0A8:1E01
*Dec 28 17:24:06.779: ICMPv6: Received echo request, Src=2000::C0A8:1E01, Dst=3001:11:0:1::1
*Dec 28 17:24:06.783: ICMPv6: Sent echo reply, Src=3001:11:0:1::1, Dst=2000::C0A8:1E01
*Dec 28 17:24:06.839: ICMPv6: Received echo request, Src=2000::C0A8:1E01, Dst=3001:11:0:1::1
*Dec 28 17:24:06.843: ICMPv6: Sent echo reply, Src=3001:11:0:1::1, Dst=2000::C0A8:1E01
*Dec 28 17:24:06.907: ICMPv6: Received echo request, Src=2000::C0A8:1E01, Dst=3001:11:0:1::1
R3#
*Dec 28 17:24:06.907: ICMPv6: Sent echo reply, Src=3001:11:0:1::1, Dst=2000::C0A8:1E01
*Dec 28 17:24:07.015: ICMPv6: Received echo request, Src=2000::C0A8:1E01, Dst=3001:11:0:1::1
*Dec 28 17:24:07.015: ICMPv6: Sent echo reply, Src=3001:11:0:1::1, Dst=2000::C0A8:1E01
R3#

R2#show ipv6 nat translations
Prot  IPv4 source              IPv6 source
     IPv4 destination         IPv6 destination
---   ---                      ---
     192.168.30.1             2000::C0A8:1E01

---   150.11.3.1               3001:11:0:1::1
     ---                      ---