Address Allocation from the Reserved Class A Address Space
An Internet Draft,  Observations on the Use of Components of the Class
A Address Space within the Internet,  explores the allocation of the
upper half of the currently reserved Class A address space through dele 
gated registries. As the demand for IP addresses continues to grow, it
may be necessary to allocate the address space. The
address block is huge and represents 25 percent of the IPv4 unicast
address space. 
Implications of Address Allocation Policies
An Internet Draft,  Implications of Various Address Allocation Policies
for Internet Routing,  discusses the fundamental issues that must be
considered as the Internet develops new unicast address allocation and
management policies. The draft compares the benefits and limitations of
an  address ownership  policy with an  address lending  policy. 
Address ownership means that when an address block is assigned to an
organization, it remains allocated to that organization for as long as the
organization wants to keep it. This means that the address block is
portable and that the organization could use it to gain access to the
Internet no matter where the organization connects to the Internet. 
Address lending means that an organization obtains its address block on
a loan basis. If the loan ends, the organization can no longer use the
borrowed address block. It must obtain new addresses and must renum 
ber those addresses before using them. 
Hierarchical routing requires that addresses reflect the network topol 
ogy in order to permit route aggregation. The draft argues that two fun 
damental problems break the hierarchical addressing and routing model
supported by CIDR:
  The continued existence of routes prior to CIDR that cannot be aggre 
  Organizations that switch ISPs and continue to use addresses from
their previous ISP's address block. 
The new ISP cannot aggregate the old address block as part of its aggre 
gation, so it must inject an exception route into the Internet. If the
number of exception routes continues to increase, it will erode the ben 
efits of CIDR and prevent the scalability of the Internet's routing sys 
The draft recommends that large providers, which can express their
destinations with a single prefix, be assigned address blocks following
the address ownership model. However, all allocations from these
providers to a downstream client should follow the address lending
model. This means that if an organization changes its provider, the loan
is canceled and the client is required to renumber addresses.
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