What is Unique Local IPv6 Unicast Address?

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- August 3, 2020 at 11:29 am #14004
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  What is Unique Local IPv6 Unicast Address?
- August 3, 2020 at 11:30 am #14005
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  In IPv6, Unique Local IPv6 Unicast Addresses are similar to private addresses in IPv4. These addresses are used for local communications. But, Unique Local IPv6 Unicast Addresses are globally unique, especially when used within a site.
  
  A Unique Local IPv6 Unicast Address uses a well-known prefix. As a result, it is easier to filter packets with a Unique Local IPv6 Unicast Address at site boundaries. And, each Unique Local IPv6 Unicast Address uses a unique prefix. As a result, multiple sites can interconnect with each other without creating any address conflicts.
  
  A Unique Local IPv6 Unicast Address has the following format:
  
  Prefix | L | Global ID | Subnet ID | Interface ID
  
  The 7-bit prefix is specified as FC00::/7. The first 7 bits of the prefix are 1111 110.
  
  The L bit is set to 1 to indicate that the address is locally assigned.
  
  The next 40 bits specify the Global ID. The Global ID is used to create a globally unique prefix and it is a pseudo-random number that is generated with a pseudo-random generator to ensure uniqueness.
  
  The next 16 bits specify the subnet ID. And, the last 64 bits are for interface ID.
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