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On my network I have port 113 forwarded to 192.168.1.50. I only have three computers on my network so I'll never have that IP. By doing that, if some attempts to connect to that port the packets will be dropped since there is no computer there.
I do this with my cisco router. I forward port 23 (which doesn't allow logins on the router) to machine 192.168.0.254 and port 80 (cisco web setup) to the same address. There will never be any machine at that address, so I don't have to worry about people trying to connect. I hope.