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Old 2nd August 2010
3th3r 3th3r is offline
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Join Date: May 2010
Location: Los Angeles
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From the official Apache docs, this is the explanation of the first field in the access log entry:

"This is the IP address of the client (remote host) which made the request to the server. If HostnameLookups is set to On, then the server will try to determine the hostname and log it in place of the IP address. However, this configuration is not recommended since it can significantly slow the server. Instead, it is best to use a log post-processor such as logresolve to determine the hostnames. The IP address reported here is not necessarily the address of the machine at which the user is sitting. If a proxy server exists between the user and the server, this address will be the address of the proxy, rather than the originating machine."
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