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Steps to take if your DHCP is attacked

My Dynamic Host Configuration Protocol was attacked. It still releases IP addresses but will not send out new ones. The problem didn't correct itself when I reinstalled. What should I do?
You did not mention what DHCP software you are using, but I am going to assume that you are using Microsoft DHCP services. With Windows 2000 and Windows 2003, DHCP servers need to be authorized. If you have not authorized the server after you reinstalled it, this could be causing the problem. In addition, it's possible that the DHCP database is corrupt. If that is the case, after uninstalling the server I would make sure that the DHCP database was removed, manually deleting it if required before I reinstalled.

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