[ppml] 2002-3: Micro-Assignments for Multihomed Networks
This policy proposal is being re-posted to the public
policy mailing list to encourage continued discussion.
This policy proposal was previously discussed on this
mailing list and at the ARIN X Public Policy Meeting.
Following previous discussions on this mailing list
and at the ARIN X Public Policy Meeting, it has been
determined consensus to pass this proposal as a new
policy has not yet been achieved.
The authors have modified the text to clarify the
intent and purpose of the proposal.
American Registry for Internet Numbers (ARIN)
### * ###
Policy Proposal 2002-3: Micro-Assignments for Multihomed Networks
End User Assignments
The minimum block of IP address space assigned by ARIN is
a /20. If assignments smaller than /20 are needed, end-users
should contact their upstream provider.
If an end-user is not multi-homed, the minimum block of IP
address space assigned by ARIN is a /20. If assignments
smaller than /20 are needed, end-users should contact their
If an end-user is multi-homed, and has an ARIN assigned
ASN, the minimum block of IP address space assigned by
ARIN is a /22. If assignments smaller than a /22 are
needed, end users should contact their upstream provider.
Many end-user organizations are choosing to multi-home
for reliability reasons. At the same time, many are
using technologies such as NAT, or load balancers that
reduce the need for external IP space. These groups
are forced today to take one of two actions:
1) Use IP space from one of their upstreams on both
connections. This can lead to load balancing
issues, and also makes the end-user more dependent
on the ISP who assigned the space. The ISP's
business problems, for instance could force downtime
2) "Waste" address space (often by not using the
technologies that conserve it) in order to qualify
for a /20 under the current policy.
In order to allow people to both conserve address
space, and reap the benefits of multi-homing the
minimum size assignment for those who do multi-home
should be made smaller.