Dynamic Host Configuration Protocol version 6 (DHCPv6) is a network protocol used for configuring IPv6 addresses and other network parameters. It allows devices on a network to automatically obtain necessary network configuration information. In this article, we will discuss how to send DHCPv6 vendor options using the dhcpd server and receive them using the systemd-networkd DHCPv6 client.
DHCPv6 Vendor Options
DHCPv6 vendor options provide a way to extend the DHCPv6 protocol by including additional information specific to a particular vendor. These options can be used to configure various network parameters, such as DNS servers, domain names, and NTP servers.
To send DHCPv6 vendor options, we will use the dhcpd server. dhcpd is a DHCP server implementation that allows you to configure and manage DHCPv6 services on your network.
Configuring dhcpd to Send DHCPv6 Vendor Options
To configure dhcpd to send DHCPv6 vendor options, you need to modify the dhcpd configuration file. The location of this file may vary depending on your operating system. Here are the general steps:
- Open the dhcpd configuration file using a text editor.
- Locate the section for DHCPv6 configuration.
- Add the vendor-specific option code and value to the configuration.
- Save the configuration file and restart the dhcpd service.
Here is an example of how the configuration might look:
subnet6 2001:db8:0:1::/64 {
range6 2001:db8:0:1::100 2001:db8:0:1::200;
option dhcp6.vendor-opts code 17 = string;
option dhcp6.vendor-opts "Example Vendor Option";
}
In this example, we define a subnet and specify a range of IPv6 addresses. We then define a vendor-specific option with code 17 and set its value to "Example Vendor Option".
Receiving DHCPv6 Vendor Options with systemd-networkd
systemd-networkd is a network manager that is commonly used on Linux systems. It includes a DHCPv6 client that can receive and process DHCPv6 vendor options.
Configuring systemd-networkd to Receive DHCPv6 Vendor Options
To configure systemd-networkd to receive DHCPv6 vendor options, you need to modify the network configuration file. Here are the steps:
- Open the network configuration file using a text editor. The location of this file may vary depending on your operating system.
- Locate the section for the network interface you want to configure.
- Add the DHCPv6 vendor options configuration to the interface section.
- Save the configuration file and restart the systemd-networkd service.
Here is an example of how the configuration might look:
[Match]
Name=enp0s3
[Network]
DHCP=v6
[DHCPv6]
VendorOpts=17:Example Vendor Option
In this example, we specify the network interface "enp0s3" and set the DHCPv6 mode to "v6". We then define the DHCPv6 vendor options with the code 17 and value "Example Vendor Option".
Sending DHCPv6 vendor options using the dhcpd server and receiving them using the systemd-networkd DHCPv6 client allows you to extend the DHCPv6 protocol and configure additional network parameters. By following the steps outlined in this article, you can easily send and receive DHCPv6 vendor options on your network.
References
| Source | Link |
|---|---|
| dhcpd man page | https://linux.die.net/man/5/dhcpd |
| systemd-networkd man page | https://manpages.debian.org/buster/systemd/systemd-networkd.service.8.en.html |