What is DHCP Snooping

What are DHCP Snooping and its types? On this page, we will discuss which comes under network Technology. Also, we would like to explain DHCP and its meaning.

Before discussing this, I want to explain some information about DHCP. In such incoming paragraphs, I will explain all the terms about DHCP Snooping. I provided you with all aspects and detailed information regarding these.

What is DHCP

DHCP is also known as Dynamic Host Configuration Protocol which is used for a network management protocol. It is used for assigning the IP address and host to work them both efficiently. It is also used to design the device’s subnet mask, default gateway, and DNS Server. So, the network and the host work properly without any problems.

What is DHCP Snooping

It is a technique in a Computer Network consisting of two-layer security protection, ensuring the security of DHCP’s infrastructure. Attackers may gain access to our network by exploiting DHCP Server. To prevent various attacks, DHCP Snooping is required.

Why do we need a DHCP Snooping

We need this to protect our host and network from an unauthorized DHCP server. So an unknown DHCP server that acts like an authorized server will not be able to access information about our host and network. DHCP Snooping acts like a firewall between the DHCP Clients and DHCP Server. To protect our Server from faulty security and DHCP attack, we need DHCP Snooping. That’s why most networks nowadays use this technique as a firewall for their Server.

Categories of DHCP Snooping

  • Trusted Ports
  •  Untrusted Ports

What are Trusted Ports

Trusted Ports are those ports in which messages from DHCP Server have been trusted. Those Ports are known as Trusted Ports.

What are Untrusted Ports

Untrusted Ports are those ports in which messages from DHCP servers have not been trusted. Those Ports are knowns as Untrusted Ports.

Attacks Prevent from DHCP Snooping

  • DHCP Spoofing Attack
  •  DHCP Starvation Attack

DHCP Spoofing Attack

This attack occurs when the attacker shows themselves a host to the default gateway or DNS server to respond to the incoming DHCP request. For this reason, they can block the actual DHCP request from the original DHCP server. For this reason, attackers can perform Dos and reach the limit of IP addresses to their natural gateway. With the help of Snooping, we can stop DHCP Spoofing Attacks because they know that the host that imposes itself as DNS Server will come through the unauthorized IP by blocking them. This way, they can protect our Server from the DHCP Spoofing attack.

DHCP Starvation Attack

The most common attack done in DHCP is a DHCP Starvation Attack, in which attackers try to put a massive volume of DHCP requests to the DHCP server using a forged source MAC address. DHCP Server tries to respond to all the coming requests without knowing that it is a DHCP Starvation Attack. As a result, it will deplete the DHCP Pool by assigning all the IP addresses available to Server. In this way, a DHCP Snooping is available to protect the Server from DHCP Starvation Attack by knowing all the possible ways the incoming requests are genuine or not; this helps a lot by protecting a server from DHCP Starvation Attack.


After reading all the terms of DHCP and Snooping, it comes to protecting our DHCP server. We need to ensure the proper security of our Server. To make our Server correctly secured, we used DHCP Snooping, which means two-layer protection to protect our Server from attackers who try to steal our information in various ways. Without this, an attacker can quickly attack our DHCP Server and gain all the information in our Server, So we need a DHCP Snooping in our Server to protect themselves from the attackers.

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