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Posted on: April 2nd, 2019

Enhancing Security Against DHCP Service Denial-of-Service Attacks in Cisco Switches

The DHCP (Dynamic Host Configuration Protocol) serves a crucial role in allocating IP addresses dynamically within a network. However, it is vulnerable to attacks, including the Denial-of-Service (DoS) assault, where an attacker floods the DHCP server with numerous requests using forged MAC addresses.

A critical aspect of the DHCP process involves the server determining the lease time for the assigned IP address to the client. This duration is known as the “Lease Time.”

To safeguard against DoS attacks targeting DHCP services, Cisco switches offer a feature called DHCP Snooping. When activated, DHCP Snooping puts all ports in an untrusted state by default, preventing unauthorized DHCP messages from traversing the network.

Implementation steps include enabling DHCP Snooping on specific VLANs, designating ports as trusted for DHCP servers, and limiting the rate of DHCP messages a port can accept per second. These measures fortify the network against potential DoS attacks attempting to overwhelm the DHCP server with an excessive number of requests, ensuring smoother network operation and enhanced security.

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