The Ip Rule Set; Security Policies - D-Link DFL-1660 User Manual

3.5. The IP Rule Set

3.5. The IP Rule Set

3.5.1. Security Policies

Common Policy Characteristics
NetDefendOS Security Policies designed by the administrator, regulate the way in which traffic can
flow through the NetDefend Firewall. Policies in NetDefendOS are defined by different
NetDefendOS rule sets. These rule sets share a common means of specifying filtering criteria which
determine the type of traffic to which they will apply. This set of criteria consists of:
Source Interface
Source Network
Destination Interface
Destination Network
Service
The NetDefendOS Security Policy Rule Sets
The principle NetDefendOS rule sets that define NetDefendOS security policies, and which use the
same filtering parameters described above (networks/interfaces/service), include:
• IP Rules
These determine which traffic is permitted to pass through the NetDefend Firewall as well as
determining if the traffic is subject to address translation. They are described below.
• Pipe Rules
These determine which traffic triggers traffic shaping to take place and are described in
Section 10.1, "Traffic Shaping".
• Policy-based Routing Rules
These determine the routing table ro be used by traffic and are described in Section 4.3,
"Policy-based Routing".
• Authentication Rules
These determine which traffic triggers authentication to take place (source net/interface only)
An Interface or Interface Group where the packet is received at
the NetDefend Firewall. This can also be a VPN tunnel.
The network that contains the source IP address of the packet.
This might be a NetDefendOS IP object which could define a
single IP address or range of addresses.
An Interface or an Interface Group from which the packet
would leave the NetDefend Firewall. This can also be a VPN
tunnel.
The network to which the destination IP address of the packet
belongs. This might be a NetDefendOS IP object which could
define a single IP address or range of addresses.
The protocol type to which the packet belongs. Service objects
define a protocol/port type. Examples are HTTP and ICMP.
NetDefendOS provides a large number of predefined service
objects but administrator defined custom services can also be
created. Existing service objects can also be collected together
into service groups.
See Section 3.2, "Services" for more information about this topic.
106
Chapter 3. Fundamentals