DHCPv6 Server

The DHCPv6 Server, operating on Port 547, is responsible for assigning IPv6 addresses and configuration settings to devices within a network. This service ensures that devices can communicate over IPv6 without manual configuration. It is essential for networks transitioning to or operating with IPv6.

What is DHCPv6 Server

The DHCPv6 Server, which operates on Port 547, is a critical service for networks utilizing the IPv6 protocol. It automates the assignment of IPv6 addresses and other configuration parameters to devices, ensuring they can communicate effectively within the network. This service is particularly important as the world transitions from IPv4 to IPv6, addressing the limitations of IPv4 address exhaustion.

Introduced as part of the IPv6 suite of protocols, DHCPv6 builds on the foundation of the earlier DHCP protocol used for IPv4. It provides not only IP addresses but also other essential network configuration details such as DNS server addresses and domain search lists. This automation reduces the administrative burden and minimizes configuration errors, leading to more reliable network operations.

Organizations deploying IPv6 rely on DHCPv6 to manage their address space efficiently. The service can operate in different modes, including stateful, where it assigns specific IP addresses, and stateless, where it provides configuration parameters without assigning addresses. This flexibility allows it to be tailored to various network environments and requirements.

DHCPv6 Server runs on TCP and UDP port 547 and is official IANA port.

Security risk

If Port 547 is open and the DHCPv6 Server is running, unauthorized devices could potentially receive IPv6 addresses and network configuration, leading to security vulnerabilities. Additionally, misconfigured or rogue DHCPv6 servers could disrupt network operations by providing incorrect configuration information. Proper firewall rules and network monitoring are essential to mitigate these risks.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 547. Use StackChanges to monitor if the DHCPv6 Server port is closed and stays closed. StackChanges will send an alert if port 547 is open again.