Cabletron Systems SSIM-R8-02 Spécifications télécharger pdf (Page 265)

Enterasys Xpedition User Reference Manual 245

Configuration Examples

Using Static NAT

Static NAT can be used when the local and global IP addresses are to be bound in a fixed

manner. These bindings never get removed nor time out until the static NAT command

itself is negated. Static binding is recommended when you have a need for a permanent

type of binding.

The other use of static NAT is when the out to in traffic is the first to initialize a

connection, i.e., the first packet is coming from outside to inside. This could be the case

when you have a server in the local network and clients located remotely. Dynamic NAT

would not work for this case as bindings are always created when an in to out Internet

connection occurs. A typical example is a web server inside the local network, which

could be configured as follows:

This server, 10.1.1.2, is advertised as 192.50.20.2 to the external network.

Dynamic Configuration

The following example configures a dynamic address binding for inside addresses

10.1.1.0/24 to outside address 192.50.20.0/24:

The first step is to create the interfaces:

nat create static protocol tcp local-ip 10.1.1.2 global-ip 192.50.20.2 local-port 80 global-port 80

et.2.2

(192.50.20.1/24)

et.2.1

(10.1.1.1/24)

Global Internet

IP network 10.1.1.0/24

Router

interface 10-net interface 192-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

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

interface create ip 192-net address-netmask 192.50.20.1/24 port et.2.2

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Cabletron Systems SSIM-R8-02 Spécifications Page 265