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DNS正常查询中,什么时候会用TCP53,是否只有在区域传输过程中会用TCP,多谢 一月 11, 2005

Posted by wansion in 技术.
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呵呵,这个我知道,当客户端发出一个查询请求,名字服务器首先会返回一个udp的响应,如果该响应的TC(删减标志)为1,表明该响应超过了512字节,该响应被截断了,客户端就会用TCP重新发出这个查询请求,名字服务器会返回一个TCP的响应,当然了,主dns和辅dns在区域传输的时候肯定要用TCP了。

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