Avaya Configuring IP Services Manual de usuario descargar pdf (Pagina 404)

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Configuring IP Services

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Overview of Network Address Translation

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. Network Address Translation (NAT) helps remedy the problem of

unregistered IP addresses in IP networks.

You can configure three types of network address translation:

• Static -- Assigns 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 timeout period that you

configure.

• N-to-1 -- Assigns a range of local IP addresses to a single global IP address.

Dynamic Address Translation

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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