The University's reserves of IPv4 addresses are running low. At the current rate of
assignment, approximately two years' supply remains.
- IPv6 is not going to save us - systems will require access to IPv4-only
services for the foreseeable future.
- There is almost no possibility of acquiring additional IPv4 address space,
certainly not without paying.
- We are unlikely to be able to recover significant amounts of address space from
existing allocations - most cannot easily be relinquished.
- We cannot afford to run out entirely reserves must be retained for future
expansion of the University
- 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
- 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
- Temporary additional allocations These may be made available provided that over
an agreed timescale, normally not exceeding 3 months, either the subnet itself or
an equivalent subnet are returned back to the pool. Example: building move.
Provide a new /24 to ease a move and then return either of the /24's (new or
old one) back to the pool.
- Linknets4: we will allocate a public /30 (or a /29) for routing firewalls and VPN
- Geographical exigencies. In these cases we would consider providing a
Main outline agreed OUCS/SMG (04/12/12) & at NAG 23/01/2013.