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... allocation permits full network layer connectivity among all hosts
inside an enterprise as well as among all public hosts of different
...
... layer connectivity among all hosts
inside an enterprise as well as among all public hosts of different
enterprises. The cost of using private internet address space ...
... private internet address space is the
potentially costly effort to renumber hosts and networks between
public and private.
...
... IP connectivity the organization
would need to change IP addresses (renumber) all of its public hosts
(hosts that require Internet-wide ...
... IP addresses (renumber) all of its public hosts
(hosts that require Internet-wide IP connectivity), regardless of
...
...
It has been typical to assign globally unique addresses to all hosts
that use TCP/IP. In order to extend the life of the IPv4 address ...
...
Category 1: hosts that do not require access to hosts in other
enterprises or the Internet at large; hosts ...
... hosts in other
enterprises or the Internet at large; hosts within
this category may use IP addresses that are
...
... ambiguous between enterprises.
Category 2: hosts that need access to a limited set of outside
services (e.g., E-mail, FTP ...
... application layer gateways). For many hosts in this
category an unrestricted external access (provided
via IP ...
... privacy/security reasons. Just like
hosts within the first category, such hosts may use
IP addresses ...
... security reasons. Just like
hosts within the first category, such hosts may use
IP addresses that are unambiguous within an
...
... layer access outside the
enterprise (provided via IP connectivity); hosts in
the last category require IP addresses that are
...
...
We will refer to the hosts in the first and second categories as
"private". We will refer to the hosts in the third category as
...
... We will refer to the hosts in the first and second categories as
"private". We will refer to the hosts in the third category as
"public".
...
... Many applications require connectivity only within one enterprise and
do not need external (outside the enterprise) connectivity for the
majority of internal hosts. In larger enterprises it is often easy to
identify a substantial number of hosts using TCP/IP ...
... majority of internal hosts. In larger enterprises it is often easy to
identify a substantial number of hosts using TCP/IP that do not need
network ...
... In order to use private address space, an enterprise needs to
determine which hosts do not need to have network layer connectivity
...
... layer connectivity
outside the enterprise in the foreseeable future and thus could be
classified as private. Such hosts will use the private address space
defined above. Private hosts ...
... hosts will use the private address space
defined above. Private hosts can communicate with all other hosts
inside the enterprise, both public and private. However, they cannot
...
... address space
defined above. Private hosts can communicate with all other hosts
inside the enterprise, both public and private. However, they cannot
have IP ...
... inside the enterprise, both public and private. However, they cannot
have IP connectivity to any host outside of the enterprise. While not
having external (outside of the enterprise) IP connectivity private
...
... having external (outside of the enterprise) IP connectivity private
hosts can still have access to external services via mediating
gateways ...
...
All other hosts will be public and will use globally unique address
space assigned by an Internet Registry. Public hosts ...
... hosts will be public and will use globally unique address
space assigned by an Internet Registry. Public hosts can communicate
with other hosts inside the enterprise both public and private and
...
... Internet Registry. Public hosts can communicate
with other hosts inside the enterprise both public and private and
can have IP connectivity to public hosts ...
... hosts inside the enterprise both public and private and
can have IP connectivity to public hosts outside the enterprise.
Public hosts do not have connectivity to private hosts ...
... IP connectivity to public hosts outside the enterprise.
Public hosts do not have connectivity to private hosts of other
enterprises.
...
... hosts outside the enterprise.
Public hosts do not have connectivity to private hosts of other
enterprises.
...
...
Moving a host from private to public or vice versa involves a change
of IP address, changes to the appropriate DNS ...
... DNS entries, and changes to
configuration files on other hosts that reference the host by IP
address.
...
... Internet had used IP address space for its hosts without getting this
space assigned from the IANA. In some cases this address space ...
... Internet. Usually the cost of renumbering can be measured by
counting the number of hosts that have to transition from private to
public. As was discussed earlier, however, even if a network uses
...
... addresses within the
combined private internet may not be unique. As a result, hosts with
these addresses would need to be renumbered.
...
... deployment of tools that facilitate renumbering (e.g. Dynamic Host
Configuration Protocol (DHCP)). When deciding whether to use private
addresses ...
... This design does not need to be fixed permanently. If a group of one
or more hosts requires to change their status (from private to public
or vice versa) later, this can be accomplished by renumbering only
the hosts ...
... hosts requires to change their status (from private to public
or vice versa) later, this can be accomplished by renumbering only
the hosts involved, and changing physical connectivity, if needed. In
locations where such changes can be foreseen (machine rooms, etc.),
...
... network disruptions, it is advisable to group hosts with similar
connectivity needs on their own subnets.
...
... authority servers for each DNS zone
containing both publically and privately addressed hosts. One server
would be visible from the public address space and would contain only
...