NB3000-Line-Hd User Manual 4.2
5.4.5. Quality Of Service
NetModule routers are able to prioritize and shape certain kinds of IP traffic. This is currently
limited on egress, which means that only outgoing traffic 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 traffic by reflecting the specified 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 Classification
The classification section can be used to define the WAN interfaces on which QoS should be
active.
Parameter
QoS Interface Parameters
Interface
The WAN interface on which QoS should be active
Bandwidth congestion
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 fixed bandwidth limits as they also offer a way of
tuning the QoS behaviour.
Downstream bandwidth
The available bandwidth for incoming traffic
Upstream bandwidth
The available bandwidth for outgoing traffic
IP to ping (primary)
An IP, which answers ICMP echo requests to determine the
bandwidth of the link
IP to ping (secondary)
An IP, which answers ICMP echo requests to determine the
bandwidth of the link
When defining limits, you should consider bandwidth limits which are at least possible as
most shaping and queues algorithms will not work correctly if the specified 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.
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