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Actiontec MI424WR Manual

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Actiontec Wireless Broadband Router User Manual
161
Appendix A Quality of Service
QoS for ingress data has the following limitations, which do not exist for outgoing
data:
• QoS can only be applied to TCP streams (UDP streams cannot be delayed)
• No borrowing mechanism
• When reserving Rx bandwidth, it is strictly taken from the bandwidth of all
other classes
Furthermore, the Router cannot control the behavior of the ISP, which may not
have proper QoS handling. Unfortunately, this is a common situation. Let’s look
at a scenario of downloading a large file and surfing the Internet at the same time.
Downloading the file is distinguished by small requests, followed by very large
responses. This may result in blocking HTML traffic at the ISP. A solution for such a
situation is limiting the bandwidth of low-priority TCP connections (such as the file
download).
Differentiated Services Code Point Settings
In order to understand what DSCP is, one must first be familiarized with the
Differentiated Services model.
Differentiated Services (Diffserv) is a Class of Service (CoS) model that enhances
best-effort Internet services by differentiating traffic by users, service requirements,
and other criteria. Packets are specifically marked, allowing network nodes to
provide different levels of service, as appropriate for voice calls, video playback, or
other delay-sensitive applications, via priority queuing or bandwidth allocation, or
by choosing dedicated routes for specific traffic flows.
Diffserv defines a field in IP packet headers referred to as the Differentiated Services
Codepoint (DSCP). Hosts or routers passing traffic to a Diffserv-enabled network
will typically mark each transmitted packet with an appropriate DSCP. The DSCP
markings are used by Diffserv network routers to appropriately classify packets and
to apply particular queue handling or scheduling behavior
The Router provides a table of predefined DSCP values, which are mapped to
802.1p priority marking method. Any of the existing DSCP setting can be edited or
deleted, and new entries can be added.
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