Creating 127-bit networks in the Global Unicast Address Space - BlueCat Integrity - 26.1.0

Address Manager Administration Guide
ft:locale
en-US
Product name
BlueCat Integrity
Version
26.1.0

Create /127 networks in the Global Unicast Address space to manage point-to-point links between routers.

Using a /127 network provides the least amount of address space: only has two addresses. This allows you to manage the inter-router communication easier, especially in the presence of a large number of point-to-point links. It also has other benefits: always knowing which address the other end uses, and no “ping-pong” problem with older ICMP implementations.

Detailed discussion about the issues and solutions about /127 networks is out of the scope of this documentation, refer to RFC 3627 for more information.

About /127 Networks in Address Manager
  • A /127 network is only intended to be used for point-to-point links between routers.
  • Unlike other IPv6 networks in the Global Unicast Address space with a shorter prefixes such as /64, the Network Router Anycast won't be auto-generated in the /127 networks.
  • You can only create two IPv6 addresses in a /127 network: 0-bit and 1-bit. For example, if you have a 2100:DB8:1000:FFFF::/127 networks, you can only create 2100:DB8:1000:FFFF:0:0:0:0000 and 2100:DB8:1000:FFFF:0:0:0:0001.

To create a /127 network:

  1. Select the IPAM tab in the sidebar, then select IPv6 blocks.
  2. Select the 2000::/3 range.
  3. Select New > IPv6 network.
  4. Under General, set the following parameters:
    • Range—enter the /127 network prefix and range: 2100:db8:1000:ffff::/127.
    • Create a network range in sequence automatically—select this option to have Address Manager automatically create the first possible network in the block. The network prefix and range are calculated automatically and appear in the Range field.
      Note: Note: If you select this option in an empty Global Unicast Address Space block, Address Manager automatically creates a /64 network: 2000::/64. Make sure to change the size of the prefix to /127.
    • Name—enter a name for the network.
    • Location—select a location from the drop-down menu on which the IP object that you are adding or editing will be based.
  5. In the Change control section, add comments if required.
  6. Select Create or Create and add another.