When we turn on anonymous access, will the IP address of the requesting workstation be logged in the access log?

Hi, Yes, this is possible via IIS logs. If Anonymous authentication is configured, a hyphen (-) is logged instead of the user name.See More Info on this. Also the Client IP tracking also possible. http://support.microsoft.com/kb/313437 Use the log parser to query this: http://www.dzeee.net/sharepoint/post/2010/06/28/Log-parser-queries-for-IIS-logs.aspx in the log parser queries use hyphen "-" in the place of cs-username.Best Regards, Ashok Yadala