telnet www.newsmth.net 会失败，连不上，要telnet newsmth.net才可以连上。

ping 以后才发现 www.newsmth.net 和 newsmth.net 的IP不一样，如下所示：

>ping www.newsmth.net

Pinging em64t.newsmth.net [60.2.251.15] with 32 bytes of data:

Reply from 60.2.251.15: bytes=32 time=11ms TTL=48
Reply from 60.2.251.15: bytes=32 time=10ms TTL=48
Reply from 60.2.251.15: bytes=32 time=10ms TTL=48
Reply from 60.2.251.15: bytes=32 time=9ms TTL=48


>ping newsmth.net

Pinging newsmth.net [60.2.251.8] with 32 bytes of data:

Reply from 60.2.251.8: bytes=32 time=12ms TTL=48
Reply from 60.2.251.8: bytes=32 time=28ms TTL=48
Reply from 60.2.251.8: bytes=32 time=12ms TTL=48
Reply from 60.2.251.8: bytes=32 time=13ms TTL=48
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FROM 124.42.44.59