Preparing an IPv6 Addressing Plan
SURFnet held a workshop with its customers (universities, schools) about IPv6. There was one session about making an addressing plan for IPv6 deployment. 'With so much address space, it can't be difficult to give every network some addresses'. It turned out that different organisations had different ideas about how to do this. After realising that making an addressing plan takes more thought than expected, I was asked to help by Rogier Spoor from Surfnet. I went to two universities that were already deploying IPv6 to talk about their experiences. Based on that (and my own experience of course), I wrote this document for SURFnet. I never expected that there would be such a high demand for it .
An addressing plan using the IPv4 system limits the options available to an organisation, because there are relatively few IPv4 addresses still available. This is why the IPv4 addressing system is based on efficient address assignment. If you apply for an IPv6 address range, most Local Internet Registries (LIRs) will allocate 280 addresses. This is such a huge amount that efficiency virtually ceases to be an issue. This is why it is worthwhile adopting an IPv6 addressing plan: a system in which you assign the IPv6 addresses to locations and/or use types.
In an efficient IPv6 addressing plan, the IPv6 addressing ranges are grouped effectively and logically. This has several advantages, including:
- Security policies are easier to implement, such as the configuration of access lists and firewalls
- Addresses are easier to trace: the address contains information about the use type or location where the address is in use
- An efficient addressing plan is scalable: it can be expanded, for example, to include new locations or use types
- An efficient IPv6 addressing plan also enables more efficient network management
This manual will show you how to prepare an effective IPv6 addressing plan. In making that plan, you will need to make a number of important choices. Please think carefully about these choices to ensure that the addressing plan will meet the requirements of your organisation. The manual will provide suggestions to help you to make the right choices.