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Steve Riggins,
Software Deveoper
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Translating the numeric address into the name is referred to as a 'reverse' lookup because the standard lookup that the DNS system does is to translate the name into the numeric address.
With this option Apache does a reverse DNS lookup on the server IP address that the client connected to in order to work out self-referential URLs.
A reverse lookup occurs when a server has an IP address (from a client host connecting to it) and wishes to get the corresponding client hostname.
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Dave Simons,
Internet Entrepeneur
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It allows you to route email within your own domain; specify reverse DNS lookups for your routed networks; and switch from a dynamic IP address to a static one and vice versa.
This method performs a reverse DNS lookup on the connecting IP address that can cause long delays if DNS has not been set up on the server.
This configuration will cause the server to perform a reverse DNS lookup on the client IP address, regardless of the setting of the HostnameLookups directive.
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Mike Enlow,
Internet Marketer
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If a hostname is valid and returns an IP address, the reverse DNS lookup of the IP address should return the same hostname.
Reverse DNS ( Domain Name System ) lookup is a process by which an Internet user queries an IP Address to map it to the domain name that is associated with it.
A possible work around to the theft of service attack described above would be to perform a reverse DNS lookup on the ip address returned by the forward lookup and compare the two names.
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