Thank you for answer. Unfortunately we can't use Cloudflare because it is pay service and third party service.
The better solution is fix the vbulletin software to avoid multiple session creation by one user (IP address).
I trying to find something like this here and on official Vbulletin site, but can't find nothing that strange.
Do somebody has this problem and know reliable solution? It's still actual for me because attack is not finished.
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