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Home/ Questions/Q 4906
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Sneha Singh
Sneha SinghLevel 40
Asked: February 3, 20222022-02-03T08:25:52+05:30 2022-02-03T08:25:52+05:30

Which Statement Describes Ipv6 Ulas?

Which Statement Describes Ipv6 Ulas?
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    1. Maryam Khalid Bronze
      2022-02-18T09:00:57+05:30Added an answer on February 18, 2022 at 9:00 am

      Which statement describes IPv6 ULAs?

      • It is responsible to obtain the IPv6 address space.
      • ISP is responsible to assign the IPv6 ULAs.
      • It can start with fe80: :/ prefix.
      • Over the internet, it is not routable.

      Answer: ULAs is the IPv6 unique local address that is alike the IPv4 private address and it is not routable over the internet They do not hold IPv6 addresses. The network prefix for ULAs is the fc00:/7 range.

      What do you know about the ULAs?

      ULAs stands for the unique local address in an IPv6 with the address range fc00: :/7. The IPv4 private network is quite similar to the IPv6 ULAs. The ULAs might use freely without any centralized registration within the single site or in the company. ULAs are routable on the private network but not on the global IPv6 Internet.

      The prefix used by the unique local address is fc00: :/7 and it is extended with an L bit that indicates it is locally assigned. The address is divided into equal parts such as fc00: :/8 and fd00: :/8.

      Format of ULAs

      bits 7 1 40 16 64
      field prefix L random Subnet id Interface identifier

       

      Prefix contains the value in binary form 1111110. The L bit is held for locally assigned addresses and the range of L starts at 0, which is not set correctly. Only once the random field is selected only in the /48 prefix path.

      However, L bit 0, FC00: :/8 Is not defined and the proposal for an allocation authority for the management of it comes but is still not accepted by the IETF. The L bit 1 or the local address. fd00: :/8 is split to /48 prefixes which is created by adjusting the 40 bits which are following the fd8: :/ prefix to the randomly created bit string.

      The result for the prefix is in the form of fdXX: XXXX: XXXX: :/48 for all the prefixes in that range. If the user is not able to access the source for the random number then a proposal is suggested by RFC 4193 by forming the random identifier which can obtain a minimum-quality result for it.

      Characteristics of the ULAs:

      Some of the unique local address characteristics are defined in the following:

      • The range fd00: :/8 prefix is similar to the IPv4 private address range.
      • In the address registry, the ranges are not assigned and might be used without any involvement of an outsider.
      • There is no guarantee that they are completely globally unique.
      • The reverse DNA entries for the prefix fd00: :/8, ULAs are not implemented in the global DNS.
      • The prefix fd00: :/8 is not meant to be used by the outside of the administrative system, that is why there is no need to worry about the ULAs prefixes uniqueness
      • The fc00: :/7 subnet is responsible to assign the IPv6 ULAs, and technically from the bottom half of the fd00: :/8.
      • From this range, the ULAs generate the random 40 bits, though they are assigned manually for easy to remember.
      • They are expected to be global in scope.
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