127 0 0 1

1、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 Settingsptiger>ping 127.0.0.1Pinging 127.0.0.1 with 32 bytes of data:Reply from 127.0.0.1: bytes=32 time<1ms TTL=128Reply from 127.0.0.1: bytes=32 time<1ms TTL=128Reply from 127.0.0.1: bytes=32 time<1ms TTL=128Reply from 127.0.0.1: bytes=32 time<1ms TTL=128Ping statistics for 127.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% lApproximate 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。

2、因为如果ping 127.0.0.1都出问题的话。

3、代表作业系统的tcp/ip通讯协定已经出问题了。