How Do You Keep Banned Members Banned?

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1) When we ban normally it says "ban by IP" yet people just take out new accounts and come back with the same IP. Are we missing something in the method or is there anything we can do with the package we have - something we're missing?

2) Even when we ban by IP using the matrix table we occasionally see someone get back in with a new user name and it's shows up on the search by IP as the same IP of the matrix banned number.

3) Are there flags or alarms we could use to alert us when certain IP addresses come back?

4) Can we ban proxy IP automatically - some sort of proxy IP detection?

5) Are their third party add-ons or stand alone software available, more effective in handling this sort of continual problem?

Thanks for your valuable time and energy.