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I record the name, IP and time/date of each person who logs into my site in a flat (or text) file. I do this as a quick reference to IPs that I may need to ban... I have some bad eggs!
Edit: although it's not my IP number, and my flat file has this same IP number for everyone who logs in, except the final sub of numbers changes randomly to 128, 129 or 130. (xxx.xxx.xxx.128)
Edit 2: also, I should mention this worked fine for 2 days, then started repeating the IPs. I changed no code during that time, so I'm assuming yahoo did something... I am just stumped.
If you work in a clustered server environment, say 2 or 3 servers that handle PHP request, the load balancer is responsible for forwarding a request to the least busy server.