What is a DHCPv6 DUID?
Each DHCPv6 client and server is identified by a DHCP unique identifier (DUID). The DUID is carried in client identifier and server identifier options. The DUID is unique across all DHCP clients and servers, and it is stable for any specific client or server.
What is DUID in DHCP?
DHCP Unique Identifier. The DHCP Unique Identifier (DUID) is used by a client to get an IP address from a DHCPv6 server. It has a 2-byte DUID type field, and a variable-length identifier field up to 128 bytes.
What is the duid-ipv6 format?
The DUID-IPv6 format makes no statement about the method used for generating the IPv6 address, but its use in control messages asserts that the address has been ensured unique through some unspecified means. The following sections present the DUID-IPv6 format and type designation. 2.
What happens when a DHCPv6 client requests two duids with different IAS?
When a DHCPv6 client requests two prefixes with the same DUID but with different identity association identifiers (IAIDs) on two different interfaces, these prefixes are considered to be for two different clients, and the interface information is maintained for both.
What is a Duid number?
DUIDs are used in the IPv6 addressed network to uniquely identify devices connected to the system. This is similar to MAC addresses use in an IPv4 router to identify individual devices. There are four types of DUIDs found within the IPv6 DHCP system to identify devices associated to the system (RFC 3315 and 6355).
What is Duid and IAID?
The Client ID in DHCPv6 consists of two parts: a DHCP Unique Identifier (DUID) and an Identity Association Identifier (IAID). The DUID identifies the client system (rather than just an interface, as in DHCPv4), and the IAID identifies the interface on that system.
How do I get IPv6 Duid?
The DUID is stored on the firewall in /var/phion/preserve/boxnet/DHCPv6 in the file dhclient
How many Duid can each DHCPv6 client have?
By using the entire 128 bits of the DUID space in DHCPv6, there are 2128, or 340 undecillion, possible DUIDs.
What is IAID IPv6?
IAID stands for “Identity Association Identifier”. An “identity association” (IA) is a construct through which a server and a client and identify, group and manage a set of related IPv6 addresses. Each IA consists of an IAID and associated configuration information.
What is DHCPv6 client?
Client. DHCPv6 is the version of the Dynamic Host Configuration Protocol (DHCP) for Internet Protocol Version 6 (IPv6) networks.
What is the DUID for the server?
Each entity in a DHCP operation, the client and the server, has a DHCP unique identifier (DUID). DHCP clients use DUIDs to identify a server in messages where a server needs to be identified.
Should I use DHCP for IPv6?
If you're running a dual-stack environment, with both IPv4 and IPv6, then it probably makes sense to use DHCP and DHCPv6. This gives you the most consistency and control over your environment.
Is DHCPv6 necessary?
1) For address provisioning DHCPv6 is no longer needed (hosts can do that on their own, via SLAAC), for the default gateway it can't be used, and the vast majority of systems can get their DNS resolvers via RAs (option 25/RDNSS as of RFC 8106; see also Chris' post when Windows 10 eventually had it).
What is the difference between DHCPv4 and DHCPv6?
DHCPv4 – The administrator enables DHCP for each interface. Administration is on a per-logical interface basis. DHCPv6 – Explicit configuration is not necessary. This protocol is enabled on a given physical interface.
When a DHCPv6 client requests two prefixes with the same DUID but with different identity?
When a DHCPv6 client requests two prefixes with the same DUID but with different identity association identifiers (IAIDs) on two different interfaces, these prefixes are considered to be for two different clients, and the interface information is maintained for both.
What is DHCPv6 prefix?
The IPv6 Access Services—DHCPv6 Prefix Delegation feature can be used to manage link, subnet, and site addressing changes. Dynamic Host Configuration Protocol for IPv6 (DHCPv6) can be used in environments to deliver stateful and stateless information, which are defined as follows:
What is IAPD in a device?
An Identity Association for Prefix Delegation (IAPD) is a collection of prefixes assigned to a requesting device. A requesting device may have more than one IAPD; for example, one for each of its interfaces.
What is DHCPv6 client?
The DHCPv6 client function can be enabled on individual IPv6-enabled interfaces. The DHCPv6 client can request and accept those configuration parameters that do not require a server to maintain any dynamic state for individual clients, such as DNS server addresses and domain search list options.
How is IAPD identified?
Each IAPD is identified by an IAID. The IAID is chosen by the requesting device and is unique among the IAPD IAIDs on the requesting device. IAIDs are made consistent across reboots by using information from the associated network interface, which is assumed to be permanently attached to the device.
How does DHCPv6 work?
The DUID is unique across all DHCP clients and servers, and it is stable for any specific client or server. DHCPv6 uses DUIDs based on link-layer addresses for both the client and server identifier. The device uses the MAC address from the lowest-numbered interface to form the DUID. The network interface is assumed to be permanently attached to the device.
What is stateless DHCPv6?
Stateless DHCPv6 allows DHCPv6 to be used for configuring a node with parameters that do not require a server to maintain any dynamic state for the node. The use of stateless DHCP is controlled by router advertisement (RA) messages multicasted by routers.
What is a DUID in network?
Clients and servers do not process DUIDs for other information. A DUID consists of a two-octet type code represented in network byte order, followed by a variable number of octets that make up the actual identifier; for example, ...
What is DHCPv6 type 2?
By default, the DHCPv6 local server application in JunosE Software uses the Type 2 server DUID for allocation of IPv6 prefixes from the delegating router, which is an E Series router configured as a DHCPv6 local server to requesting routers, which is the customer premises equipment (CPE) at the edge of the remote client site that acts as the DHCP client. In scenarios in which the CPE does not support the Type 2 DUID, or if the service provider uses a DUID type other than Type 2, the verification of identity of servers and clients by each other using DUIDs does not happen successfully. In such network environments, configuring the DUID type on the DHCPv6 local server to be other than the default value of Type 2 enables correct identity verification of clients and servers.
Why do DHCP servers use DUIDs?
DHCP servers use DUIDs to determine the configuration parameters to be used for clients and in the association of addresses with clients. The DUID is contained in the client identifier and server identifier options. The DUID is stable for any specific client or server.
What is type 2 DUID?
The Type 2 DUID is assigned by the vendor to the device and contains the vendor's registered private enterprise number as maintained by the IANA, followed by a unique identifier assigned by the vendor.
Can you modify a DUID?
You cannot modify the DUID type when at least one active DHCP client connection exists.
What is DHCPv6 prefix?
DHCPv6 prefix delegation provides a mechanism for configuring such routers.
What is DHCPv6?
The Dynamic Host Configuration Protocol version 6 ( DHCPv6) is a network protocol for configuring Internet Protocol version 6 (IPv6) hosts with IP addresses, IP prefixes and other configuration data required to operate in an IPv6 network. It is the IPv6 equivalent of the Dynamic Host Configuration Protocol for IPv4. DHCPv6 is defined by RFC 8415 .
What port does DHCPv6 use?
DHCPv6 uses UDP port number 546 for clients and port number 547 for servers.
How many bits are in a DUID?
The server compares the DUID with its database and delivers configuration data (address, lease times, DNS servers, etc.) to the client. The first 16 bits of a DUID contain the DUID type, of which there are four types. The meaning of the remaining DUID depends on the type.
Why is DHCPv6 not needed?
DHCPv6 is not necessary for configuring hosts with the addresses of Domain Name System (DNS) servers, because they can be configured using Neighbor Discovery Protocol, which is also the mechanism for stateless autoconfiguration . Many IPv6 routers, such as routers for residential networks, must be configured automatically with no operator ...
