Billion Electric Company BiGuard 2 - Manual (Page 21)

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2.2.7 DiffServ (DSCP Marking)
DiffServ (a.k.a. DSCP Marking) allows you to classify traffic based on IP DSCP values.
These markings can be used to identify traffic within the network. Other interfaces
can match traffic based on the DSCP markings. DSCP markings are used to decide
how packets should be treated, and is a useful tool to give precedence to varying
types of data.
2.3 Virtual Private Networking
A Virtual Private Network (VPN) enables you to send data between two computers
across a shared or public network in a manner that emulates the properties of a
point-to-point private link. As such, it is perfect for connecting branch offices to
headquarter across the Internet in a secure fashion.
The following section discusses Virtual Private Networking with BiGuard 2/10.
2.3.1 General VPN Setup
There are typically three different VPN scenarios. The first is a Gateway to
Gateway setup, where two remote gateways communicate over the Internet via a