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P-2601HN(L)-F1 Series User’s Guide
131
C
HAPTER
9
DNS Route
9.1
Overview
DNS (Domain Name System) is for mapping a domain name to its corresponding
IP address and vice versa. The DNS server is extremely important because
without it, you must know the IP address of a machine before you can access it.
In addition to the system DNS server(s), each WAN interface (service) is set to
have its own static or dynamic DNS server list. You can configure a DNS static
route to forward DNS queries for certain domain names through a specific WAN
interface to its DNS server(s). The ZyXEL Device uses a system DNS server (in the
order you specify in the
Broadband
screen) to resolve domain names that do not
match any DNS routing entry. After the ZyXEL Device receives a DNS reply from a
DNS server, it creates a new entry for the resolved IP address in the routing table.
In the following example, the DNS server 168.92.5.1 obtained from the WAN
interface ptm0.100 is set to be the system DNS server. The DNS server
10.10.23.7 is obtained from the WAN interface ppp1.123. You configure a DNS
route for *example.com to have the ZyXEL Device forward DNS requests for the
domain name mail.example.com through the WAN interface ppp1.123 to the DNS
server 10.10.23.7.
Figure 56
Example of DNS Routing Topology
WAN
LAN
ptm0.100
ppp1.123
DNS:10.10.23.7
DNS:168.92.5.1
sip.service.com
mail.example.com
(Default)
Page 132 / 344
Chapter 9 DNS Route
P-2601HN(L)-F1 Series User’s Guide
132
9.2
The DNS Route Screen
The
DNS Route
screens let you view and configure DNS routes on the ZyXEL
Device. Click
Network Setting > DNS Route
to open the
DNS Route
screen.
Figure 57
Network Setting > DNS Route
The following table describes the labels in this screen.
9.2.1
Add/Edit DNS Route Edit
Click
Add new DNS route
in the
DNS Route
screen or the
Edit
icon next to an
existing DNS route. Use this screen to configure the required information for a
DNS route.
Figure 58
DNS Route: Add/Edit
Table 26
Network Setting > DNS Route
LABEL
DESCRIPTION
Add new DNS
route
Click this to create a new entry.
#
This is the number of an individual DNS route.
Status
This shows whether the DNS route is currently in use or not.
A yellow bulb signifies that this DNS route is in use. A gray bulb signifies
that this DNS route is not in use.
Domain Name
This is the domain name to which the DNS route applies.
WAN Interface
This is the WAN interface through which the matched DNS request is
routed.
Modify
Click the
Edit
icon to configure a DNS route on the ZyXEL Device.
Click the
Delete
icon to remove a DNS route from the ZyXEL Device.
Page 133 / 344
Chapter 9 DNS Route
P-2601HN(L)-F1 Series User’s Guide
133
The following table describes the labels in this screen.
Table 27
DNS Route: Add/Edit
LABEL
DESCRIPTION
Active
Select this to activate this DNS route.
Domain Name
Enter the domain name you want to resolve.
You can use the wildcard character, an “*” (asterisk) as the left most part
of a domain name, such as *.example.com. The ZyXEL Device forwards
DNS queries for any domain name ending in example.com to the WAN
interface specified in this route.
WAN Interface
Select a WAN interface through which the matched DNS query is sent.
You must have the WAN interface(s) already configured in the
Broadband
screen.
Apply
Click
Apply
to save your changes.
Back
Click
Back
to exit this screen without saving.
Page 134 / 344
Chapter 9 DNS Route
P-2601HN(L)-F1 Series User’s Guide
134
Page 135 / 344
P-2601HN(L)-F1 Series User’s Guide
135
C
HAPTER
10
Quality of Service (QoS)
10.1
Overview
This chapter discusses the ZyXEL Device’s
QoS
screens. Use these screens to set
up your ZyXEL Device to use QoS for traffic management.
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. QoS allows the ZyXEL Device to group and prioritize application traffic
and fine-tune network performance.
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.
The ZyXEL 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
Internet gaming, and those for which jitter alone is a problem such as Internet
radio or streaming video.
Note: The ZyXEL Device has built-in configurations for Voice over IP (IP). The Quality
of Service (QoS) feature does not affect VoIP traffic.
•
See
Section 10.6 on page 146
for advanced technical information on SIP.
10.1.1
What You Can Do in this Chapter
•
Use the
General
screen to enable QoS, set the bandwidth, and allow the ZyXEL
Device to automatically assign priority to upstream traffic according to the IEEE
802.1p priority level, IP precedence or packet length (
Section 10.2 on page
136
).
•
Use the
Queue Setup
screen to configure QoS queue assignment (
Section 10.3
on page 138
).

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