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Peng Hailin 2016-09-08 09:25:00 +08:00
parent 3b2716a915
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16
d08-Integrating-IPv4-and-IPv6-Network-Environments.md
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@ -102,15 +102,15 @@ end
而要查看具体的IPv4及IPv6接口参数，只需使用思科IOS软件的`show ip interface [name]`或`show ipv6 interface [name]`命令即可。下面是`Fastethernet0/0`接口上`show ip interface`的输出：
<pre>
```
R3#show ip interface FastEthernet0/0 | section address
Internet address is 10.0.0.3/24
Broadcast address is 255.255.255.255
Helper address is not set
<b>Secondary address 10.0.1.3/24
Secondary address 10.0.2.3/24</b>
Secondary address 10.0.1.3/24
Secondary address 10.0.2.3/24
Network address translation is disabled
</pre>
```
下面的输出则演示了上一示例中用到的同样的`Fastethernet0/0`接口的`show ipv6 interface`命令，所打印出的信息：
@ -142,20 +142,20 @@ R1(config)#ipv6 host TEST-HOST 3FFF:1234:ABCD:1::3
该静态IPv4与IPv6主机配置可使用`show hosts`命令进行验证，下面打印出了改命令的输出：
<pre>
R1#<b>show hosts</b>
```
R1#show hosts
...
[Truncated Output]
...
Host Port Flags Age Type Address(es)
TEST-HOST None (perm, OK) 0 IP 10.0.0.3
TEST-HOST None (perm, OK) 0 IPv6 3FFF:1234:ABCD:1::3
</pre>
```
在同一主机同时配置一个IPv4及IPv6地址时，思科IOS软件将使用IPv6地址。如有使用DNS，那么在主机同时配置了IPv6及IPv4 DNS服务器时，该双栈主机将先搜寻AAAA（IPv6）记录，并（在查询不到时）回滚到A记录（IPv4）（If DNS is used, the dual-stack host will first search AAAA(IPv6) records and then fall back to the A records(IPv4) when configured with both IPv6 and IPv4 DNS servers）。可想下面这样通过执行一次简单的到先前配置的静态主机`TEST-HOST`的`ping`操作，对此默认行为进行验证：
```
R1#<b>ping test-host repeat 10</b>
R1#ping test-host repeat 10
Type escape sequence to abort.
Sending 10, 100-byte ICMP Echos to 3FFF:1234:ABCD:1::3, timeout is 2 seconds:
!!!!!!!!!!