does not map back to the address 

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[\~]\$ ssh 192.168.0.233

Address 192.168.0.233 maps to localhost, but this does not map back to
the address - POSSIBLE BREAK-IN ATTEMPT!

Last login: Thu Nov 26 10:29:29 2009 from 192.168.0.235

用 ssh 时，经常看到这样的警告信息，挺闹心的，因为DNS服务器把 192.168.0.x 的地址都反向解析成 localhost ，而DNS服务器不是咱们自己的，没办法改。

找到一种办法，编辑 ssh 客户端的 /etc/hosts 文件，把出问题的 IP 地址和主机名加进去，就不会报这样的错了。

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