Avocent SPC420 manual NAT Devices

Chapter 4: Basic Operations 53

NAT Devices

NAT devices enable a company to use more internal IP addresses than they have assigned to managed appliances. The IP addresses are not exposed outside of the NAT device.

NAT devices are typically used with a DSL broadband router. A DSView 3 software client is connected to the NAT device, as shown in Figure 1.6, which then connects to the corporate network using a VPN.

Figure 4.3: Single NAT Configuration (Client Only)

Table 4.6: Single NAT Configuration (Client Only) Descriptions

Number	Description	Number	Description
1	DSView 3 Software Client	7	Firewall
2	Private	8	Private
3	NAT Device	9	DSView 3 Server
4	Client	10	Managed Appliance
5	Public	11	Corporate
6	VPN

Another scenario, shown in Figure 4.4 on page 54, is when the corporate site also uses a NAT device to save IP addresses (double-NAT). Since the DSView 3 software client is trying to access a private resource inside the corporate site, the TCP/IP ports used for HTTPS and the proxy server must be configured to be exposed on the corporate NAT device.