127.0.0.1是什么

Localhost 代表的是本机的位置, 通常其对应的IP 是127.0.0.1
一般而言：如果你作业系统的tcp/ip通讯协定如果设定正确
ping 127.0.0.1应该出现下列讯息
C:\Documents and Settings\ptiger>ping 127.0.0.1
Pinging 127.0.0.1 with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Ping statistics for 127.0.0.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% l
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
所以这是测试网路通不通的第一步骤，因为如果ping 127.0.0.1都出问题的话，代表作业系统的tcp/ip通讯协定已经出问题了