Avocent DSView 3, Installer/User Manual

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Chapter 1: Product Overview 31
separate companies that merged but have not resolved their IP addresses. See NAT Devices on
page 31.
Figure 1.5: DSView 3 Software System on a VPN
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 1.6: Single NAT Configuration (Client Only)
Another scenario, shown in Figure 1.7, 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.
Target Devices
Replication
Hub Server DSView 3
Software Client
Target Devices
Firewall
Site A
Site B
VPN
Spoke Server
DSView 3 Software Client
Public
DSView 3 Software
Client
Managed
Appliance
Firewall
Corporate
VPN
DSView 3
Software
Server
Client
NAT Device
Private
Private