What Is Traffic Shaping; Why Do We Perform Traffic Shaping In The P-662H-D - ZyXEL Communications ADSL2+ 4-port Security Gateway Support Notes

P-662H-D Series Support Notes
For forwarding the inbound IPSec ESP tunnel, A 'Default' server set is required.
You could configure it in Web Configurator, Advanced Setup, Network -> NAT
-> Port Forwarding -> Default Server Setup:
It is because SUA makes your LAN appear as a single machine to the outside
world. LAN users are invisible to outside users. So, to make an internal server
for outside access, we must specify the service port and the LAN IP of this
server in Web configurator. Thus SUA is able to forward the incoming packets
to the requested service behind SUA and the outside users access the server
using the P-662H-D's WAN IP address. So, we have to configure the internal
IPsec client as a default server (unspecified service port) when it acts a server
gateway.

14. What is Traffic Shaping?

Traffic Shaping allocates the bandwidth to WAN dynamically and aims at
boosting the efficiency of the bandwidth. If there are serveral VCs in the
P-662H-D but only one VC activated at one time, the P-662H-D allocates all
the Bandwidth to the VC and the VC gets full bandwidth. If another VCs are
activated later, the bandwidth is yield to other VCs after ward.

15. Why do we perform traffic shaping in the P-662H-D?

The P-662H-D must manage traffic fairly and provide bandwidth allocation for
different sorts of applications, such as voice, video, and data. All applications
have their own natural bit rate. Large data transactions have a fluctuating
natural bit rate. The P-662H-D is able to support variable traffic among
different virtual connections. Certain traffic may be discarded if the virtual
connection experiences congestion. Traffic shaping defines a set of actions
taken by the P-662H-D to avoid congestion; traffic shaping takes measures to
adapt to unpredictable fluctuations in traffic flows and other problems among
virtual connections.
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