User guide

34 DSView Installer/User Guide
Several factors related to the network setup, including the DSView software database replication
schedule and methods of device access, can affect the speed of a multi-site VPN network. The
trade-off must be made based on the network setup.
Frequent replication of the DSView software database will increase WAN/VPN traffic but provide
steady data reception at the local sites. Infrequent database replication made at the various sites
decreases the WAN/VPN traffic but delays the reception of changes at the local site.
In addition, the methods used to access devices affects network speed. VPN access of a managed
appliance is always slower than local access.
The DSView management software supports VPNs that provide full transparency for IP addresses,
as well as ports between sites and many VPNs that perform network address translation (NAT)
between sites. For example, the VPN in Figure 1.6 could use NAT if Site A and Site B are separate
companies that merged but have not resolved their IP addresses. See Using a NAT device on
page 34 for more information.
Figure 1.6: DSView Software System on a VPN
Using a NAT device
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 software client is
connected to the NAT device, as shown in Figure 1.7, which then connects to the corporate
network using a VPN.
Target Devices
Replication
Hub Server
DSView Software
Client
Target Devices
Firewall
Site A
Site B
VPN
Spoke Server
DSView Software Client