Zyxel P-870HN-51b Router Manual PDF (Setup & Configuration Guide)

Page 186 / 382 Scroll up to view Page 181 - 185

Chapter 14 DNS Route

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186

The following table describes the labels in this screen.

14.2.1

DNS Route Setup

Click the

Add

button in the

DNS Route

screen. Use this screen to configure the

required information for a DNS policy route.

Figure 97

DNS Route: Add

The following table describes the labels in this screen.

Table 63

Advanced > DNS Route

LABEL

DESCRIPTION

Domain Name

This is the domain name to which the DNS policy route applies.

Subnet Mask

This is the subnet mask of the domain name.

WAN Interface

This is the WAN interface through which the Device sends DNS queries

that match this DNS policy route.

Add

Click this to create a new rule.

Remove

Click the icon to remove a rule from the Device. A window displays asking

you to confirm that you want to delete the rule.

Table 64

DNS Route: Add

LABEL

DESCRIPTION

Domain Name

Enter the domain name to which the DNS policy route applies.

Subnet Mask

Enter the subnet mask of the domain name.

Use Interface

Select a WAN interface through which the traffic is sent. You must have

the WAN interface(s) already configured in the

WAN

screens.

Back

Click

Back

to return to the previous screen without saving.

Apply

Click

Apply

to save your changes back to the Device.

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HAPTER

15

RIP

15.1

Overview

Routing Information Protocol (RIP, RFC 1058 and RFC 1389) allows a device to

exchange routing information with other routers.

15.1.1

What You Can Do in this Chapter

The

RIP

screen lets you set up RIP settings on the Device (

Section 15.2 on page

187

).

15.2

The RIP Screen

Click

Advanced > RIP

to open the

RIP

screen.

Figure 98

Advanced > RIP

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Chapter 15 RIP

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188

The following table describes the labels in this screen.

Table 65

Advanced > RIP

LABEL

DESCRIPTION

Interface

This is the name of the interface in which the RIP setting is used.

Version

The RIP version controls the format and the broadcasting method of the

RIP packets that the Device sends (it recognizes both formats when

receiving). RIP version

1

is universally supported but RIP version

2

carries more information. RIP version

1

is probably adequate for most

networks, unless you have an unusual network topology.

Operation

Select

Passive

to have the Device update the routing table based on the

RIP packets received from neighbors but not advertise its route

information to other routers in this interface.

Select

Active

to have the Device advertise its route information and also

listen for routing updates from neighboring routers.

Enabled

Select the check box to activate the settings.

Apply/Save

Click

Apply/Save

to save your changes back to the Device.

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16

Quality of Service (QoS)

16.1

Overview

Quality of Service (QoS) refers to both a network’s ability to deliver data with

minimum delay, and the networking methods used to control the use of

bandwidth. Without QoS, all traffic data is equally likely to be dropped when the

network is congested. This can cause a reduction in network performance and

make the network inadequate for time-critical application such as video-on-

demand.

Configure QoS on the Device to group and prioritize application traffic and fine-

tune network performance. Setting up QoS involves these steps:

1

Configure classifiers to sort traffic into different flows.

2

Assign priority and define actions to be performed for a classified traffic flow.

The Device assigns each packet a priority and then queues the packet accordingly.

Packets assigned a high priority are processed more quickly than those with low

priority if there is congestion, allowing time-sensitive applications to flow more

smoothly. Time-sensitive applications include both those that require a low level of

latency (delay) and a low level of jitter (variations in delay) such as Voice over IP

(VoIP) or Internet gaming, and those for which jitter alone is a problem such as

Internet radio or streaming video.

This chapter contains information about configuring QoS and editing classifiers.

16.1.1

What You Can Do in this Chapter

• The

General

screen lets you enable or disable QoS, set the bandwidth, and

allow the Device to automatically assign priority to upstream traffic according to

the IEEE 802.1p priority level, IP precedence or packet length (

Section 16.3 on

page 191

).

• The

Queue Setup

screen lets you lets you configure QoS queue assignment

(

Section 16.4 on page 193

).

• The

Class Setup

screen lets you add, edit or delete QoS classifiers (

Section

16.5 on page 196

).

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Chapter 16 Quality of Service (QoS)

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• The

Policer Setup

screens lets you add, edit or delete QoS policers (

Section

16.6 on page 202

).

• The

Monitor

screen lets you view the Device's QoS-related packet statistics

(

Section 16.7 on page 205

).

16.2

What You Need to Know

The following terms and concepts may help as you read through this chapter.

QoS versus Cos

QoS is used to prioritize source-to-destination traffic flows. All packets in the same

flow are given the same priority. CoS (class of service) is a way of managing traffic

in a network by grouping similar types of traffic together and treating each type as

a class. You can use CoS to give different priorities to different packet types.

CoS technologies include IEEE 802.1p layer 2 tagging and DiffServ (Differentiated

Services or DS). IEEE 802.1p tagging makes use of three bits in the packet

header, while DiffServ is a new protocol and defines a new DS field, which replaces

the eight-bit ToS (Type of Service) field in the IP header.

Tagging and Marking

In a QoS class, you can configure whether to add or change the DSCP (DiffServ

Code Point) value, IEEE 802.1p priority level and VLAN ID number in a matched

packet. When the packet passes through a compatible network, the networking

device, such as a backbone switch, can provide specific treatment or service

based on the tag or marker.

Traffic Shaping

Bursty traffic may cause network congestion. Traffic shaping regulates packets to

be transmitted with a pre-configured data transmission rate using buffers (or

Rate

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