DHCP In a VPC

  • DHCP (Dynamic Host Configuration Protocol) is a network protocol that provides configuration information to hosts on a TCP/IP network.

  • It helps automatically assign important network settings like IP addresses, domain names, and DNS servers to devices (hosts).

⚙️ DHCP in AWS VPC

  • When you create a VPC, AWS automatically creates a set of DHCP options and associates them with your VPC.

  • DHCP options include parameters such as:

    • Domain name

    • Domain name server (DNS)

    • NetBIOS node type (for legacy systems)

  • You can also configure your own custom DHCP options for the VPC, if needed.

🧠 Quick Summary

Feature
Description

Purpose

Automatically assign network configuration (IP, DNS)

Automatic Configuration

AWS creates default DHCP options for VPC

Customization

You can define your own DHCP options set

  • A standard protocol used to automatically assign network configuration to devices in a TCP/IP network.

  • It provides settings like:

    • Domain name

    • DNS servers

    • NetBIOS node type

🛠️ DHCP in AWS VPC

  • When you create a VPC, AWS automatically creates a default DHCP options set.

  • This DHCP options set is associated with the VPC by default.

  • You can also create your own DHCP options set to customize:

    • DNS servers

    • Domain name

    • Other DHCP options

🧠 Quick Summary

Feature
Description

Purpose of DHCP

Automatically assign IP-related config to devices

Used in AWS for

Setting up DNS, domain names, NetBIOS for instances in a VPC

Default behavior

AWS creates a DHCP options set automatically with every VPC

Customization

You can define your own DHCP options and attach them to a VPC

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