What is DHCP?

DHCP (Dynamic Host Configuration Protocol) is the service that automatically gives each device an IP address and basic network settings when it connects, so nobody has to type them in by hand. In small offices the router usually runs it; larger companies run it on a server. The DHCP server keeps a list of which device received which address and when, called leases. That list is useful for security: it helps you find out which device had an address named in an alert, and it reveals devices you did not know were connected. Keep those records for as long as an investigation might need them.

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