Avaya Configuring IP Services Bedienungsanleitung Seite 360

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Configuring IP Services
12-2 117356-A Rev. A
Overview
Network Address Translation (NAT) helps remedy the problem of the use of
unregistered IP addresses in IP networks.
As corporate networks grow, they often use the Internet protocol without
acquiring registered network addresses. This is acceptable as long as the network
remains private. However, when access to the global Internet is required, conflicts
often arise between private local addresses and global addresses registered to
other users. While it is possible to restructure the local network, the job is difficult
and costly, especially if there are “well-known” servers with links or references to
each other.
You can configure two types of NAT address mapping:
Static -- Assign a permanent “well-known” registered address to a specific
private “unregistered” host address for a one-to-one map.
Dynamic -- Assigns address translation on an as-needed basis. NAT software
recycles dynamically mapped addresses after a user-configurable timeout
period.
Dynamic Mapping
Using NAT, you can create a pool of registered IP network addresses, and remap
your current addresses to addresses allocated from this pool when establishing a
connection outside your company’s private or local network. The connection
appears to the host or server on the Internet as if it is from the registered address
space.
For example, Company A, which uses a nonregistered IP addressing scheme
within its network environment, needs to access resources in Company B’s
network. Company B is located in a different network on the Internet. In this
environment, NAT enables communications between the networks of Company A
and Company B without requiring either company to restructure its existing
network.
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