Avocent Network Device SPC420, Installer/User Manual

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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)
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.
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