Traffic Shaping; Differentiated Services - Fortinet FortiGate FortiGate-5001 Administration Manual

Policy
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In most cases you should make sure that users can use DNS through the firewall
without authentication. If DNS is not available users cannot connect to a web, FTP, or
Telnet server using a domain name.
Note: Policies that require authentication must be added to the policy list above matching
policies that do not; otherwise, the policy that does not require authentication is selected first.

Traffic Shaping

Traffic Shaping controls the bandwidth available to and sets the priority of the traffic
processed by the policy. Traffic Shaping makes it possible to control which policies
have the highest priority when large amounts of data are moving through the
FortiGate device. For example, the policy for the corporate web server might be given
higher priority than the policies for most employees' computers. An employee who
needs unusually high-speed Internet access could have a special outgoing policy set
up with higher bandwidth.
If you set both guaranteed bandwidth and maximum bandwidth to 0 (zero), the policy
does not allow any traffic.
Guaranteed You can use traffic shaping to guarantee the amount of bandwidth available
through the firewall for a policy. Guarantee bandwidth (in Kbytes) to make
Bandwidth
sure that there is enough bandwidth available for a high-priority service.
Maximum You can also use traffic shaping to limit the amount of bandwidth available
through the firewall for a policy. Limit bandwidth to keep less important
Bandwidth
services from using bandwidth needed for more important services.
Traffic Priority Select High, Medium, or Low. Select Traffic Priority so that the FortiGate unit
manages the relative priorities of different types of traffic. For example, a
policy for connecting to a secure web server needed to support e-commerce
traffic should be assigned a high traffic priority. Less important services
should be assigned a low priority. The firewall provides bandwidth to low-
priority connections only when bandwidth is not needed for high-priority
connections.

Differentiated Services

Differentiated Services describes a set of end-to-end Quality of Service (QoS)
capabilities. End-to-end QoS is the ability of a network to deliver service required by
specific network traffic from one end of the network to another. By configuring
differentiated services you configure your network to deliver particular levels of service
for different packets based on the QoS specified by each packet.
Differentiated Services (also called DiffServ) is defined by RFC 2474 and 2475 as
enhancements to IP networking to enable scalable service discrimination in the IP
network without the need for per-flow state and signalling at every hop. Routers that
can understand differentiated services sort IP traffic into classes by inspecting the DS
field in IPv4 header or the Traffic Class field in the IPv6 header.
You can use the FortiGate Differentiated Services feature to change the DSCP
(Differentiated Services Code Point) value for all packets accepted by a policy. The
network uses these DSCP values to classify, mark, shape, and police traffic, and to
perform intelligent queuing. DSCP features are applied to traffic by configuring the
routers on your network to apply different service levels to packets depending on the
DSCP value of the packet.
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Firewall
Fortinet Inc.