lucy24 - 8:27 pm on Aug 11, 2011 (gmt 0)
What, exactly, do you mean by track? (Sorry. You know exactly what you mean, but we don't.) The IP is in the raw logs. What you do with the logs depends on you and your log-wrangling software. The busier your site is, the more complicated it gets. If you're dealing with something like public WiFi, you'd have to look at the User Agent to get meaningful information.* And if it's a public terminal, as in a library, you're not likely to get much of anything useful.
* Unless you are the Chinese government and are only concerned with whether the IP exists at all. (Different thread.)