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ISP
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... APNIC) or by an Internet Service Provider (ISP). This assignment of
a value in the most significant bit positions historically has been
...
...
High-order-part-only renumbering is most common when an organization
changes ISPs, and needs to renumber into the new provider's space.
The old prefix ...
...
Both the high-order and low-order parts may change. This might
happen when the enterprise changes to a new ISP, who assigns address
space from a CIDR block rather than a classful network ...
... data base, but the
reverse mapping data base may be maintained by its ISP. This can
require coordination when changing providers.
...
... enterprise has been using 10.0.0.0/8 as its primary prefix, but has
introduced an ISP whose registered addresses were in 172.31.0.0/16.
...
... externally-controlled part of the prefix, as might be the case when
an organization changes ISPs and renumbers into the ISP's address
space, without changing the internal subnet ...
... prefix, as might be the case when
an organization changes ISPs and renumbers into the ISP's address
space, without changing the internal subnet structure.
...
... configuration changes. Since the outside screening router
may be under the control of the ISP rather than the entrerprise,
administrative coordination will be needed.
...
... routing mechanism between some
customers and their ISPs, as a means simpler than BGP for the
customer ...
... BGP. RIP is not
infrequently used to allow ISPs to learn dynamically of new customer
routes, although there are security concerns in such an approach.
...
... DNS changes.
Coordinate changes with affected external organizations (e.g.,
ISPs, business partners, routing registries)
...