Utilities exist which monitor ports and, in response to given criteria, e.g., an apparent denial-of-service attack, can block access to them from particular IP addresses or domains, by dynamically configuring TCP Wrappers and/or IPTables (and other software). Perhaps the most notable is PortSentry, which until very recently could be freely downloaded from Psionic. However Psionic were recently bought by Cisco and the download is not available and Cisco are not responding to my email, but all is not lost. I have a local mirror.
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