What Is Ddns Wildcard? Does The P-661Hnu-Fx Support Ddns Wildcard; What Is Traffic Shaping; Why Do We Perform Traffic Shaping In The P-661Hnu-Fx; What Do The Parameters (Pcr, Scr, Mbs) Mean - ZyXEL Communications P-661HNU-Fx Support Notes

P-661HNU Series Support Notes
14. What is DDNS wildcard? Does the P-661HNU-Fx support DDNS
wildcard?
Some DDNS servers support the wildcard feature which allows the hostname,
*.yourhost.dyndns.org, to be aliased to the same IP address as
yourhost.dyndns.org. This feature is useful when there are multiple servers
inside and you want users to be able to use things such as
www.yourhost.dyndns.org and still reach your hostname.
Yes, the P-661HNU-Fx supports DDNS wildcard that http://www.dyndns.org/
supports. When using wildcard, you simply enter your host.dyndns.org in the
Host field in „Network Setting -> Dynamic DNS‟ to configure Dynamic DNS.

15. 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-661HNU-Fx but only one VC activated at one time, the P-661HNU-Fx
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.

16. Why do we perform traffic shaping in the P-661HNU-Fx?

The P-661HNU-Fx 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-661HNU-Fx 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-661HNU-Fx to avoid congestion; traffic shaping takes
measures to adapt to unpredictable fluctuations in traffic flows and other
problems among virtual connections.

17. What do the parameters (PCR, SCR, MBS) mean?

Peak Cell Rate(PCR): The maximum bandwidth allocated to this connection.
The VC connection throughput is limited by PCR.
Sustainable Cell Rate(SCR): The least guaranteed bandwidth of a VC.
When there are multi-VCs on the same line, the VC throughput is guaranteed
by SCR.
Maximum Burst Size(MBS): The amount of cells transmitted through this
VC at the Peak Cell Rate before yielding to other VCs. Total bandwidth of the
line is dedicated to single VC if there is only one VC on the line. However, as
the other VC asking the bandwidth, the MBS defines the maximum number of
cells transmitted via this VC with Peak Cell rate before yielding to other VCs.
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