, the voting system has been brushed

Emergency help, the voting system was brushed.
Now the practice is based on IP and date to judge, is the date of the day check whether there is no same IP voting, that is, an IP can only vote once a day.
Now the situation is that a certain data is 1000+ by the IP of the vote, and the verification code I do not know how to bypass the past, is it because my verification code is purely digital, too simple?

About those IP is all of our urban IP, and the frequency of voting is about two minutes a vote.

Now I have IP access is getenv (' remote_addr '), I really do not have this experience, ask you Daniel.

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------Solution--------------------
In general, $_server[' REMOTE_ADDR ' is the user's real IP, it is difficult to forge ...

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