Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 613)

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BCM 4.0 Networking Configuration Guide

Chapter 66

Configuring NAT (Network Address Translation)

BCM provides security and firewall features to protect your private data resources from outsiders.

The following links provide information about the different types of NAT:

• “Enabling and disabling NAT” on page 614

• “Configuring an Interface with NAT” on page 614

The Network Address Translation feature is a network security feature. NAT translates the IP

addresses used within your private network to different IP addresses known to Internet users

outside your private network. NAT helps ensure network security because each outgoing or

incoming request must go through a translation process that also provides the opportunity to

qualify or authenticate the request or match it to a previous request. NAT also translates port

numbers.

NAT is defined by creating a set of rules and then defining the order in which these rules are

evaluated.

BCM supports both static and dynamic NAT for a number of packet types and protocols:

Static NAT

Static NAT is the one-to-one mapping of an IP address on your private network to an IP address

from outside your network. Inbound rules must have external IP addresses mapped to specific

internal IP addresses.

Dynamic NAT

Dynamic NAT is the mapping between a private network and the outside network, of one address

to a pool of addresses, a pool of addresses to one address or a pool of addresses to another pool of

addresses. The mappings are made in a translation table and remain there until the table is cleared

or until an entry times out.

NAT and IP Policy filters

When you use NAT and IP Policy filters, there are two interactions you need to be aware of:

NAT Support for: Type

Packets (static and

dynamic)

IP, TCP, UDP, TCP/UDP

Protocols ALL, FTP, Telnet, SMTP, SNMP-TRAP, DNS, TFTP, Gopher, Finger, H.323, SIP, HTTP, HTTPS,

POP3, NNTP, SUNRPC, SUNNFS, UNISTIM, CUSTOM

Note: When using an inbound translation, be sure that all private addresses belong to the

existing systems.

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