Draytek Vigor2133 Vac, Руководство пользователя

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Vigor2133 Series User’s Guide 349
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S S e e s s s s i i o o n n s s L L i i m m i i t t
A PC with private IP address can access to the Internet via NAT router. The router will
generate the records of NAT sessions for such connection. The P2P (Peer to Peer) applications
(e.g., BitTorrent) always need many sessions for procession and also they will occupy over
resources which might result in important accesses impacted. To solve the problem, you can
use limit session to limit the session procession for specified Hosts.
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The downstream or upstream from FTP, HTTP or some P2P applications will occupy large of
bandwidth and affect the applications for other programs. Please use Limit Bandwidth to
make the bandwidth usage more efficient.
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Deploying QoS (Quality of Service) management to guarantee that all applications receive the
service levels required and sufficient bandwidth to meet performance expectations is indeed
one important aspect of modern enterprise network.
One reason for QoS is that numerous TCP-based applications tend to continually increase their
transmission rate and consume all available bandwidth, which is called TCP slow start. If
other applications are not protected by QoS, it will detract much from their performance in
the overcrowded network. This is especially essential to those are low tolerant of loss, delay
or jitter (delay variation).
Another reason is due to congestions at network intersections where speeds of
interconnected circuits mismatch or traffic aggregates, packets will queue up and traffic can
be throttled back to a lower speed. If there’s no defined priority to specify which packets
should be discarded (or in another term “dropped”) from an overflowing queue, packets of
sensitive applications mentioned above might be the ones to drop off. How this will affect
application performance?
There are two components within Primary configuration of QoS deployment:
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Classification: Identifying low-latency or crucial applications and marking them for
high-priority service level enforcement throughout the network.
 Scheduling: Based on classification of service level to assign packets to queues and
associated service types
The basic QoS implementation in Vigor routers is to classify and schedule packets based on
the service type information in the IP header. For instance, to ensure the connection with the
headquarter, a teleworker may enforce an index of QoS Control to reserve bandwidth for
HTTPS connection while using lots of application at the same time.
One more larger-scale implementation of QoS network is to apply DSCP (Differentiated
Service Code Point) and IP Precedence disciplines at Layer 3. Compared with legacy IP
Precedence that uses Type of Service (ToS) field in the IP header to define 8 service classes,
DSCP is a successor creating 64 classes possible with backward IP Precedence compatibility. In
a QoS-enabled network, or Differentiated Service (DiffServ or DS) framework, a DS domain
owner should sign a Service License Agreement (SLA) with other DS domain owners to define
the service level provided toward traffic from different domains. Then each DS node in these
domains will perform the priority treatment. This is called per-hop-behavior (PHB). The
definition of PHB includes Expedited Forwarding (EF), Assured Forwarding (AF), and Best
Effort (BE). AF defines the four classes of delivery (or forwarding) classes and three levels of
drop precedence in each class.