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
Up: Contents Next: 2.
Sections in this document:
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.
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.
Primarily the imminent large-scale projects eg Integrated Communications and
the TONE Projects.
Normally network addresses which are not destination addresses in and of