Provider Independent (PI) IPv6 addresses are a key component for organizations seeking to maintain control over their addressing infrastructure without relying on a specific internet service provider (ISP). This article provides a detailed overview of PI IPv6 addresses, their benefits, applications, and technical aspects.

What Are PI IPv6 Addresses?

PI IPv6 addresses are a special type of IP address assigned directly to an organization by a Regional Internet Registry (RIR), such as RIPE NCC in Europe. These addresses are not tied to any specific ISP, offering organizations greater flexibility when changing providers.

• Assignment: Directly from an RIR, not through an ISP.

• Format: PI IPv6 addresses use the same structure as regular IPv6 addresses but are designated with a specific prefix.

Benefits of PI IPv6 Addresses

• Provider Independence: PI addresses allow organizations to change ISPs without needing to readdress their entire network.

• Stability: They ensure consistent and long-term use of addresses regardless of changes in network infrastructure.

• Multihoming Capability: They enable connectivity to multiple ISPs, enhancing redundancy and availability.

Technical Requirements and Limitations

To obtain PI IPv6 addresses, organizations must meet certain requirements:

• Eligibility: They must demonstrate the need for PI addresses.

• Technical Readiness: Networks must be capable of supporting the routing of PI addresses.

• Fees: RIRs typically charge fees for the allocation and maintenance of PI addresses.

Difference Between PI and PA IPv6 Addresses

• PI (Provider Independent): Assigned directly to an organization and are not dependent on an ISP.

• PA (Provider Aggregatable): Assigned through an ISP, meaning that addresses must be replaced when switching providers.

Use Cases for PI IPv6 Addresses

PI IPv6 addresses are primarily used by organizations that:

• Have complex network infrastructures.

• Require high levels of availability and redundancy.

• Operate data centers or global services.

How to Obtain PI IPv6 Addresses

1. Register with an RIR: Organizations must register with their respective Regional Internet Registry (e.g., RIPE NCC).

2. Submit an Address Request: Organizations must file a request detailing their needs and intended use.

3. Technical Review: The RIR assesses the organization’s technical preparedness.

4. Prefix Allocation: Upon approval, the organization receives its unique IPv6 PI prefix.

Routing and Management of PI IPv6 Addresses

PI IPv6 addresses can be more challenging to manage in terms of routing:

• Routing Table Impact: PI addresses can increase the size of the global routing table as they are not aggregated like PA addresses.

• BGP Configuration: Organizations often use BGP (Border Gateway Protocol) to advertise their PI addresses.

PI IPv6 addresses are a vital tool for organizations seeking independence and flexibility in managing their IP infrastructure. Whether for data centers, content providers, or large corporations, PI addresses provide a solution for long-term stability and multihoming. If your organization plans to utilize PI IPv6 addresses, it is recommended to carefully consider the technical requirements and consult the respective RIR for guidance.