Single organizations with multi-homed, discrete networks
richardj at arin.net
Wed May 9 08:17:16 EDT 2001
During the open microphone session at the ARIN public policy
meeting last month the issue of single organizations with
multi-homed, discrete networks was raised.
When these organizations receive an allocation from ARIN, they
split it up and assign a minimum of a /20 to each multi-homed,
discrete network. There is a concern that a longer prefix
would be filtered. Although this satisfies their concerns about
filtering, it often conflicts with ARIN's policy for requesting
additional IP address space. ARIN's policy states an organization
must demonstrate 80% of their previous allocation is efficiently
utilized before their request for additional IP address space will
Apply the following scenario: An ISP receives a /18 from ARIN and
splits it up into four /20s -- one for each of their multi-homed,
discrete networks. After some time, one of those networks may
have utilized 75% of its /20, but the others may be growing at a
slower rate and only be at 25% each. The network that is at 75%
would soon need additional IP address space, but the overall
utilization of the /18 obtained from ARIN would only be at 37.5%.
This would prevent that organization from meeting the criteria
for obtaining additional IP address space from ARIN.
Knowing this to be the case, the ISP may elect to justify a
separate maintainer account with ARIN for that single multi-
homed, discrete network. This eliminates any consideration
of the growth rate of the other networks when applying for
additional IP address space. If an ISP was to do this for
other networks they would soon have many maintainer accounts
open with ARIN.
Should ARIN make a change to its policy that takes this issue
into consideration and prevents organizations from having to
open multiple maintainer accounts to meet the IP addressing
needs of their multi-homed, discrete networks?
This question is posed as a continuation of the discussion
that took place at the recent public policy meeting. Your
feedback is requested.
Director of Operations
American Registry for Internet Numbers (ARIN)
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