1. Background

The University's reserves of IPv4 addresses are running low. At the current rate of assignment, approximately two years' supply remains.

  1. IPv6 is not going to save us - systems will require access to IPv4-only services for the foreseeable future.
  2. There is almost no possibility of acquiring additional IPv4 address space, certainly not without paying.
  3. We are unlikely to be able to recover significant amounts of address space from existing allocations - most cannot easily be relinquished.
  4. We cannot afford to run out entirely reserves must be retained for future expansion of the University
  5. Future IPv4 allocations must be limited to a maximum of 256 addresses (/24 subnets). An extremely strong justification must be required for any exception to this rule.
  6. The future is considerably more NAT. However this is implemented, it will bring its own challenges and incur significant (direct and indirect) costs for the University.

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Notes
1.
As defined by PRAS University organisation chart. We use the designation Unit to cover Sub-Unit where more appropriate. The exact boundary is ill defined. IT Services will endeavour to be as fair as practical to both the group directly concerned and the University as a whole.
2.
We are allowing only 10.128/9 because LIN already uses 10.0.0.0/12 & 10.16.0.0/12. This should avoid potential clashes when we start routing RFC 1918 in the core.
3.
Primarily the imminent large-scale projects eg Integrated Communications and the TONE Projects.
4.
Normally network addresses which are not destination addresses in and of themselves.