Quality Of Service - NetModule NB3000-Line-Hd User Manual

5.4.5. Quality Of Service

NetModule routers are able to prioritize and shape certain kinds of IP tra c. This is currently
limited on egress, which means that only outgoing tra c can be stipulated.
The current QoS solution is using Stochastic Fairness Queueing (SFQ) classes in combination
with Hierarchy Token Bucket (HTB) qdiscs. Its principle of operation can be summarized as
ceiling the max. throughput per link and shaping tra c by re ecting the speci ed queue
priorities. In general, the lowest priority number of a queue gets most out of the available
bandwidth.
In case of demands for other class or qdisc algorithms please contact our support team in
order to evaluate the best approach for your application.
QoS Administration
The administration page can be used to enable and disable QoS.
QoS Classi cation
The classi cation section can be used to de ne the WAN interfaces on which QoS should be
active.
Parameter
Interface
Bandwidth congestion
Downstream bandwidth
Upstream bandwidth
IP to ping (primary)
IP to ping (secondary)
When de ning limits, you should consider bandwidth limits which are at least possible as
most shaping and queues algorithms will not work correctly if the speci ed limits cannot
be achieved. In particular, any WWAN interfaces operating in a mobile environment are
suffering variable bandwidths, thus rather lower values should be used.
NB3000-Line-Hd User Manual 4.2
QoS Interface Parameters
The WAN interface on which QoS should be active
The bandwidth congestion method. In case of auto the system
will try to apply limits in a best-effort way. However, it is sug-
gested to set xed bandwidth limits as they also offer a way of
tuning the QoS behaviour.
The available bandwidth for incoming tra c
The available bandwidth for outgoing tra c
An IP, which answers ICMP echo requests to determine the
bandwidth of the link
An IP, which answers ICMP echo requests to determine the
bandwidth of the link
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