What is the recommended IPv6 prefix length?
What is the recommended IPv6 prefix length?
Each hexadecimal character in an IPv6 prefix represents one nibble, which is 4 bits. The length of a delegated prefix should therefore always be a multiple of 4, so the possible choices are /48, /52, /56 and /60. A third motivation behind the /48 recommendation was to better support network growth common at many sites.
What is prefix length notation?
In IPv4, the prefix (or network portion) of the address can be identified by a dotted-decimal netmask, commonly referred to as a subnet mask. For example, 255.255. 255.0 indicates that the network portion, or prefix length, of the IPv4 address is the leftmost 24 bits.
What is prefix in IPv6 address?
The prefix of an IPv6 link-local address is represented textually as “fe80::/n”, where n MAY be any value between 10 and 127. Regardless of the prefix length, the leftmost 10 bits of an IPv6 link-local address MUST be set to binary 1111111010 (hexadecimal fe80).
What is my network prefix length?
The prefix length determines the size of the subnet and is the number of 1 bits in the netmask. With variable-length subnetting, the prefix length does not have to be a multiple of 8. For example, you can have the IP address 192.168. 123.224, with a netmask = 255.255.
How many IPv6 addresses are in a 56?
IPv6 Relative Network Sizes
| /128 | 1 IPv6 address | A network interface |
|---|---|---|
| /64 | 1 IPv6 subnet | 18,446,744,073,709,551,616 IPv6 addresses |
| /56 | 256 LAN segments | Popular prefix size for one subscriber site |
| /48 | 65,536 LAN segments | Popular prefix size for one subscriber site |
| /32 | 65,536 /48 subscriber sites | Minimum IPv6 allocation |
What are two types of IPv6 unicast addresses?
Loopback and link-local are specific types of unicast addresses.
What is a preferred DNS?
The preferred DNS is a specified primary choice to handle Internet protocol mapping. If the preferred choice times out after a time limit defined by an operating system, it will then attempt to try the alternate DNS. Servers are subject to the same connectivity problems a home user may experience.
What is subnet prefix length?
Prefix length specifies the number of bits in the IP address that are to be used as the subnet mask. You can specify the prefix length for a network interface by using the ifconfig command.
What does DHCP mean for IPv6 address assignment?
DHCP for IPv6 Address Assignment. DHCPv6 enables DHCP servers to pass configuration parameters, such as IPv6 network addresses, to IPv6 clients. The DHCPv6 Individual Address Assignment feature manages nonduplicate address assignment in the correct prefix based on the network where the host is connected.
What should be read in conjunction with DHCPv6?
This document should be read in conjunction with the DHCPv6 specification, RFC 3315 [ 2 ], for a complete specification of the Prefix Delegation options and mechanism. Definitions for terms and acronyms not specifically defined in this document are defined in RFC 3315 .
How are prefixes assigned in an IPv6 network?
This mechanism is intended for delegating a long- lived prefix from a delegating router to a requesting router, across an administrative boundary, where the delegating router does not require knowledge about the topology of the links in the network to which the prefixes will be assigned. Table of Contents 1.
Where does DHCPv6 Prefix delegation take place in a CPE?
The prefix delegation occurs between a provider edge (PE) device and customer premises equipment (CPE) using the DHCPv6 prefix delegation option. Once the ISP has delegated prefixes to a customer, the customer may further subnet and assign prefixes to the links in the customer’s network.