ipv4也可以和ipv6类似的简写（ping和telnet中使用，win/mac/linux亲测通用）

我们知道，ipv6地址因为很长，中间如果都是0的场景下，可以压缩简写，例如：

3ffe:0000:0000:0000:1010:2a2a:0000:0001 可以简写压缩为：3ffe::1010:2a2a::0001

ipv4在telnet和ping使用的时候，也可以有类似的简写方式，我们来看一下：

• IP地址中间两个都是零的情况下，可以省略：

如127.0.0.1可以用127.1表示；10.0.0.2可以用10.2表示

[root@centos opt]# ping 127.1
PING 127.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.027 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.030 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.020 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.035 ms

--- 127.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 112ms
rtt min/avg/max/mdev = 0.020/0.028/0.035/0.005 ms

[root@centos opt]# telnet 10.2 80
Trying 10.0.0.2...
Connected to 10.0.0.2.
Escape character is '^]'.

• IP地址倒数第二个是0，可以省略

如192.168.0.1可以用192.168.1表示；172.16.0.2可以用172.16.2表示

[root@centos opt]# ping 192.168.1
PING 192.168.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.036 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.044 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.075 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=0.037 ms

--- 127.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 81ms
rtt min/avg/max/mdev = 0.036/0.048/0.075/0.015 ms

[root@centos opt]# telnet 172.16.2 80
Trying 172.16.0.2...
Connected to 172.16.0.2. Escape character is '^]'.