1. I believe there is a mod for that. Search "proxy" "All Mods" "Titles Only" and you will get a list of different types of mods regarding proxies. One of those should hopefully be what you are looking for.
2. You, as the admin, can enable seeing users IPs in the Who's Online list. From there, you can grab the IP and then add it to the Banned IP list in the Admin CP > Banning area. Personally, I prefer to add 'bad' IPs to my htaccess file.
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