In this article we will discuss The IPv6 Global Unicast Address, will make brief discussion on The IPv6 Global Unicast Address, In last article we discuss about Troubleshooting DNS Issues.
IPv6 subnetting requires a different approach than IPv4 subnetting. The same reasons for subnetting IPv4 address space in order to manage network traffic also apply to IPv6.
However, due to the large number of IPv6 addresses, there is no longer the concern for conserving addresses. The IPv6 address plan can focus on the best hierarchical approach to manage and assign IPv6 subnets.
Global Routing Prefix
This is the prefix, or network, portion of the address that is assigned by the provider. Typically, Regional Internet Registries (RIRs) assign a /48 global routing prefix to ISPs and customers.
Used by an organization to identify subnets within its site.
This is the equivalent to the host portion of an IPv4 address. The term Interface ID is used because a single host may have multiple interfaces, each having one or more IPv6 addresses.
IPv4 subnetting is not only about limiting broadcast domains but is also about managing address scarcity. Determining the subnet mask and the use of VLSM is done to help conserve IPv4 addresses. IPv6 subnetting is not concerned with conserving address space. The subnet ID includes more than enough subnets. IPv6 subnetting is about building an addressing hierarchy based on the number of subnetworks needed.
Recall that there are two types of assignable IPv6 addresses. An IPv6 link-local address is never subnetted because it exists only on the local link. However, an IPv6 global unicast address can be subnetted.
The IPv6 global unicast address normally consists of a /48 global routing prefix, a 16 bit subnet ID, and a 64 bit interface ID.
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