How to make apache perform domain name verification on the client

Source: Internet
Author: User
Article Title: How to enable apache to verify the domain name of the client. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
You can set it in httpd. conf:
HostnameLookups on | off | double
If the on clause is used, only one reverse lookup is performed. if the double clause is used, a forward parsing is performed after the reverse lookup. only two results match each other, and off means domain name verification is not performed.
Double is recommended for security purposes. to speed up access, off is recommended.
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