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Internet
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... IP addresses
visible within the enterprise, since some addresses (e.g., Internet
service providers, external business partners) are outside the
address space under the control of the enterprise.
...
... organization. Routing issues here are primarily those of the global
Internet, but may also involve bilateral private links to other
enterprises.
...
... Many discussions of renumbering emphasize interactions among
organizations' numbering plans and those of the global Internet
[RFC1900]. There can be equally strong motivations for renumbering
...
... [RFC1900]. There can be equally strong motivations for renumbering
in organizations that never connect to the global Internet.
According to RFC1900 ...
... Classless Inter-Domain Routing
(CIDR) is vital to keep the Internet routing system alive and to
maintain continuous uninterrupted growth of the Internet ...
... Internet routing system alive and to
maintain continuous uninterrupted growth of the Internet....To
contain the growth of routing information, whenever such an
...
... concerned would need to renumber.... If the organization does not
renumber, then some of the potential consequences may include (a)
limited (less than Internet-wide) IP connectivity, or (b) extra cost
to offset the overhead ...
... to offset the overhead associated with the organization's routing
information that Internet Service Providers have to maintain, or
both."
...
...
Dialup services, especially public Internet access providers, are
undergoing explosive growth. This success represents a particular
drain on the available address space ...
... registry (e.g., InterNIC, RIPE, or
APNIC) or by an Internet Service Provider (ISP). This assignment of
a value in the most significant bit ...
... address space [RFC1918] that
is not routable on the global Internet. Since these addresses are
not routable on the global Internet ...
... Internet. Since these addresses are
not routable on the global Internet, changing parts of private
address space prefixes ...
... DNS references to addresses that are known in
the global Internet [deGroot]. Various DNS servers throughout the
...
... Among the major reasons to renumber is to gain globally routable
address space. In the global Internet, routable address space is
based on arbitrary-length prefixes ...
... realization of prefix addressing in the global Internet. Inside
enterprises, arbitrary prefix length addressing ...
... router links rarely need to be
accessed from the Internet unless explicitly used for exterior
routing. External traceroutes will also fail reverse DNS ...
... address
spaces. If the "outside" address space (i.e., visible to the
Internet) changes, this will mean that the outside screening router
will need configuration changes ...
... +-----------+ | | Hosts | | +-----------+
From | External | | +--------+ |---| Internal |
Internet...| Screening |---| +--------+ | | Screening |
| Router | |---| Bastion|------| | Router ...
... routers typically have inbound access lists that
block unauthorized traffic from the Internet, and outbound access
lists that permit access only to DMZ servers and the bastion host.
...
... load balancing.
Most enterprises do not directly participate in global Internet
routing mechanisms, the details of which are of concern to their
...
... Hubbard, K., Kosters, M., Conrad, D., Karrenberg, D., and J. Postel, "INTERNET REGISTRY IP ALLOCATION GUIDELINES", BCP 12, RFC 2050 ...