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Configuring Network Address Translation

305753-A Rev 00

3-35

Modifying the Interface Type

The NAT router is configured with local and global interfaces. Local interfaces are

attached to the local network. When a packet arrives at the local interface, the

NAT router examines the packet’s source address to determine whether it should

be translated into a global address before forwarding. Global interfaces are

attached to the external network. When a packet arrives at the global interface, the

NAT router examines the packet’s destination address to determine whether it is

an existing translation.

By default, when you enable NAT on an IP interface, the interface type is set to

local. To configure an external interface, you must set the type to global.

Using the BCC

To modify the NAT interface type, navigate to the NAT interface prompt (for

example,

box; ethernet/13/1; ip1.2.3.4/255.0.0.0; nat

) and enter:

type

<type>

type

is one of the following:

local

(default)

global

For example, the following command sequence changes the type for NAT

interface 197.1.2.3 from local to global and verifies the change:

standard/5/1#

ip 197.1.2.3/8

ip/197.1.2.3/255.0.0.0#

nat

nat/197.1.2.3#

info

type local

state enabled

nat/197.1.2.3#

type global

nat/197.1.2.3#

info

type global

state enabled

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Avaya Configuring BFE Services Manual do Utilizador Página 79