It has a 2-byte DUID type field, and a variable-length identifier field up to 128 bytes. The DHCP unique identifier ( DUID) is used by a client to get an IP address from a DHCPv6 server.
What is dhcp client id mac mac#
You can also add static leases to issue a specific IP address to a particular client (identified by MAC address). The issued leases are showed here as dynamic entries. There's no broadcast or 'ipv6 helper-address', but rather configuration of the IPv6 relay with 'ipv6 dhcp relay destination'. Sub-menu: /ip dhcp-server lease DHCP server lease submenu is used to monitor and manage servers leases. You have to configure the hardware-address parameter in the host DHCP pool to match the MAC address of the DHCP client with the pool and the static IP address: ip dhcp pool fedi. Here's a new mnemonic acronym: SARR (Solict, Advertise, Request, Reply). One would think that the IOS DHCP server would use the MAC address as the client-ID, but that's not the case. Instead of using the interface MAC address as the client ID (as most workstations do), the client ID is the string '-ifname' where the is the interface MAC address in ascii and the. This is learned through router advertisements. If you configure a Cisco router as a DHCP client, you'll notice that it uses weird client-id in its DHCP requests (assuming you care about client IDs on the DHCP server). Instead of seeing a MAC address such as 9C:B6:D0:61:11:B5 as you might be accustomed to, you might see a unique ID such. Slowly, there is a move to start using unique client IDs instead of MAC addresses. Likewise, does IPv6 need a gateway? Unlike IPv4 DHCP, IPv6 DHCP does not provide a gateway address. Traditionally, a DHCP client (ie your computer) would send its MAC address as the client ID and would show up in your DHCP lease list as such. When stateless autoconfiguration is deployed, the host essentially grabs its own IP address with no need for an additional protocol like DHCP. The DHCP unique identifier (DUID) is used by a client to get an IP address from a DHCPv6 server.
If a workstation has obtained IP configuration information from the wrong DHCP server or another workstation was configured with the same IP address you may need to retry and contact the DHCP server to. The DUID identifies the client system (rather than just an interface, as in DHCPv4), and the IAID identifies the interface on that system.ĭHCP and IPv6 IPv6 was intentionally designed to allow stateless IP address autoconfiguration (SLAAC). Dynamic Host Configuration Protocol (DHCP) is a special server configured to pass out IP information and other IP information to network clients. The Client ID in DHCPv6 consists of two parts: a DHCP Unique Identifier (DUID) and an Identity Association Identifier ( IAID).
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