Cabletron Systems SMARTSWITCH ROUTER 9032578-05 Manual de usuario descargar pdf (Pagina 255)

SmartSwitch Router User Reference Manual 229

Chapter 16: Network Address Translation Configuration Guide

Using Dynamic NAT with DNS

When a client from outside sends a query to the static global IP address of the DNS server,

NAT will translate the global IP address to the local IP address of the DNS server. The

DNS server will resolve the query and respond with a reply. The reply can include the

local IP address of a host inside the local network (for example, 10.1.1.2); this local IP

address will be translated by NAT into a global IP address (for example, 192.50.20.2) in a

dynamic binding for the response.

Dynamic NAT with Outside Interface Redundancy

The following example configures a dynamic address binding for inside addresses

10.1.1.0/24 to outside addresses 192.50.20.0/24 on interface 192-net and to outside

addresses 201.50.20.0/24 on interface 201-net:

The first step is to create the interfaces:

Next, define the interfaces to be NAT “inside” or “outside”:

et.2.2

(201.50.20.0/24)

et.2.1

(10.1.1.1/24)

IP network 10.1.1.0/24

Router

interface 10-net interface 201-net

10.1.1.4

10.1.1.2

10.1.1.3

Outbound: Translate source pool 10.1.1.0/24 to global pool 192.50.20.0/24

Global Internet

(192.50.20.0/24)

interface 192-net

et.2.3

Translate source pool 10.1.1.0/24 to global pool 201.50.20.0/24

interface create ip 10-net address-netmask 10.1.1.1/24 port et.2.1

interface create ip 192-net address-netmask 192.50.20.0/24 port et.2.2

interface create ip 201-net address-netmask 201.50.20.0/24 port et.2.3

nat set interface 10-net inside

nat set interface 192-net outside

nat set interface 201-net outside

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Cabletron Systems SMARTSWITCH ROUTER 9032578-05 Manual de usuario Pagina 255