DHCPv6 Client

DHCPv6-Client is a protocol that allows devices to automatically obtain IPv6 addresses and other configuration details from a DHCPv6 server. This service is essential for the seamless operation of IPv6 networks, ensuring that devices can communicate effectively without manual configuration. It operates on port 546.

What is DHCPv6 Client

DHCPv6-Client is a critical protocol in the IPv6 networking stack, designed to facilitate the automatic assignment of IP addresses and configuration parameters to devices on a network. This protocol is an extension of the DHCP protocol used in IPv4 networks, adapted to support the larger address space and new features of IPv6.

The DHCPv6-Client operates by sending requests to a DHCPv6 server, which then responds with the necessary configuration information, such as IP addresses, DNS server addresses, and other network parameters. This process eliminates the need for manual configuration, reducing the potential for errors and simplifying network management.

Developed as part of the IPv6 suite of protocols, DHCPv6-Client has become increasingly important as the world transitions from IPv4 to IPv6. The protocol ensures that devices can seamlessly join and operate within an IPv6 network, supporting the growing number of internet-connected devices. Organizations and network administrators rely on DHCPv6-Client to maintain efficient and scalable network operations.

DHCPv6 Client runs on TCP and UDP port 546 and is official IANA port.

Security risk

If port 546 is open and the DHCPv6-Client service is running, it could be exploited by attackers to gain unauthorized access to network configuration information. This could lead to network disruptions or unauthorized devices joining the network. Proper firewall rules and monitoring are essential to mitigate these risks.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 546. Use StackChanges to monitor if the DHCPv6 Client port is closed and stays closed. StackChanges will send an alert if port 546 is open again.