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View old DHCP lease information

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Last Modified: 2014-06-11
Hi guys and thanks to anyone who can give me some insight here.

I have someone on my internal network who tried to access my firewall multiple times with different usernames.  It looks like it was about a week ago and the dhcp lease has expired.  I have the ip address, but no computer name.  Is there a way to find this in dhcp logs? Been looking all over with no luck.

Thanks again all
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