Comtech EF Data CDM-570/L Vipersat Parameter Editor - Manual (Page 33)

Chapter 2 - Using Parameter Editor 2-17
Network
chances of global synchronization. Thus, WRED allows the transmission line to
be used fully at all times.
Enable Filtering
QoS allows specific flows to be designated as “filtered,” so the modem/router
will discard traffic that the user does not want to forward over a satellite link.
Selecting the Enable Filtering check box enables filtering.
IP Addressing
Specific Source and Destination IP Addresses can be specified for a rule, if
desired.
Source and Destination Ports
Selecting Source and Destination Ports should only be done if the user is aware
of the port used by the desired protocol or application. There are well known
ports for various protocols, but often only command messages use these specific
ports and data is transferred through a negotiated port.
Either specific port numbers or a range of ports can be entered using the Source
Port and Destination Port Minimum and Maximum fields.
Minimum & Maximum Bandwidth
Minimum and Maximum Bandwidth values can be assigned to a flow to restrict
the bandwidths that any particular flow will utilize. The default of no bandwidth
restriction can be set by selecting the All check box.
Note that, for Rule Max/Priority, no minimum bandwidth restriction is applied
(0 bps) and can not be edited. For Rule Min/Max, a minimum value can be
assigned to the flow that allows a committed information rate (CIR) to be
applied to a user-defined class of traffic.
Tip: Once the QoS rules are defined, each type of traffic flow should be
isolated and sent to verify that it is being sent using the intended QoS rule.
Using the QoS Queue Statistics feature in the modem unit’s CLI, the traffic
flows for all of the defined QoS rules can be monitored. Statistics
displayed include the packet rate, drop rate, transmit rate, and active
flows.