Zyxel ZyWALL-USG50 Router Manual PDF (Setup & Configuration Guide)

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Chapter 45 System

ZyWALL USG 50 User’s Guide

681

5

Under

Time and Date Setup

,

enter a

Time Server Address

(

Table 211 on page

679

).

6

Click

Apply

.

45.4

Console Port Speed

This section shows you how to set the console port speed when you connect to the

ZyWALL via the console port using a terminal emulation program. See

Table 2 on

page 35

for default console port settings.

Click

Configuration > System

> Console Speed

to open the

Console Speed

screen.

Figure 385

Configuration > System > Console Speed

The following table describes the labels in this screen.

45.5

DNS 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.

Table 212

Configuration > System > Console Speed

LABEL

DESCRIPTION

Console Port

Speed

Use the drop-down list box to change the speed of the console port.

Your ZyWALL supports 9600, 19200, 38400, 57600, and 115200 bps

(default) for the console port.

The

Console Port Speed

applies to a console port connection using

terminal emulation software and NOT the

Console

in the ZyWALL Web

Configurator

Status

screen.

Apply

Click

Apply

to save your changes back to the ZyWALL.

Reset

Click

Reset

to return the screen to its last-saved settings.

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45.5.1

DNS Server Address Assignment

The ZyWALL can get the DNS server addresses in the following ways.

•

The ISP tells you the DNS server addresses, usually in the form of an

information sheet, when you sign up. If your ISP gives you DNS server

addresses, manually enter them in the DNS server fields.

•

If your ISP dynamically assigns the DNS server IP addresses (along with the

ZyWALL’s WAN IP address), set the DNS server fields to get the DNS server

address from the ISP.

•

You can manually enter the IP addresses of other DNS servers.

45.5.2

Configuring the DNS Screen

Click

Configuration > System > DNS

to change your ZyWALL’s DNS settings.

Use the

DNS

screen to configure the ZyWALL to use a DNS server to resolve

domain names for ZyWALL system features like VPN, DDNS and the time server.

You can also configure the ZyWALL to accept or discard DNS queries. Use the

Network > Interface

screens to configure the DNS server information that the

ZyWALL sends to the specified DHCP client devices.

Figure 386

Configuration > System > DNS

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The following table describes the labels in this screen.

Table 213

Configuration > System > DNS

LABEL

DESCRIPTION

Address/PTR

Record

This record specifies the mapping of a Fully-Qualified Domain Name

(FQDN) to an IP address. An FQDN consists of a host and domain

name. For example, www.zyxel.com.tw is a fully qualified domain

name, where “www” is the host, “zyxel” is the third-level domain,

“com” is the second-level domain, and “tw” is the top level domain.

Add

Click this to create a new entry.

Edit

Double-click an entry or select it and click

Edit

to be able to modify the

entry’s settings.

Remove

To remove an entry, select it and click

Remove

. The ZyWALL confirms

you want to remove it before doing so. Note that subsequent entries

move up by one when you take this action.

#

This is the index number of the address/PTR record.

FQDN

This is a host’s fully qualified domain name.

IP Address

This is the IP address of a host.

Domain Zone

Forwarder

This specifies a DNS server’s IP address. The ZyWALL can query the

DNS server to resolve domain zones for features like VPN, DDNS and

the time server.

When the ZyWALL needs to resolve a domain zone, it checks it against

the domain zone forwarder entries in the order that they appear in this

list.

Add

Click this to create a new entry. Select an entry and click

Add

to create

a new entry after the selected entry.

Edit

Double-click an entry or select it and click

Edit

to be able to modify the

entry’s settings.

Remove

To remove an entry, select it and click

Remove

. The ZyWALL confirms

you want to remove it before doing so. Note that subsequent entries

move up by one when you take this action.

Move

To change an entry’s position in the numbered list, select the method

and click

Move

to display a field to type a number for where you want

to put it and press [ENTER] to move the rule to the number that you

typed.

#

This is the index number of the domain zone forwarder record. The

ordering of your rules is important as rules are applied in sequence.

A hyphen (-) displays for the default domain zone forwarder record.

The default record is not configurable. The ZyWALL uses this default

record if the domain zone that needs to be resolved does not match

any of the other domain zone forwarder records.

Domain Zone

A domain zone is a fully qualified domain name without the host. For

example, zyxel.com.tw is the domain zone for the www.zyxel.com.tw

fully qualified domain name.

A “*” means all domain zones.

Type

This displays whether the DNS server IP address is assigned by the ISP

dynamically through a specified interface or configured manually

(

User-Defined

).

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DNS Server

This is the IP address of a DNS server. This field displays

N/A

if you

have the ZyWALL get a DNS server IP address from the ISP

dynamically but the specified interface is not active.

Query Via

This is the interface through which the ZyWALL sends DNS queries to

the entry’s DNS server. If the ZyWALL connects through a VPN tunnel,

tunnel

displays.

MX Record (for

My FQDN)

A MX (Mail eXchange) record identifies a mail server that handles the

mail for a particular domain.

Add

Click this to create a new entry.

Edit

Double-click an entry or select it and click

Edit

to be able to modify the

entry’s settings.

Remove

To remove an entry, select it and click

Remove

. The ZyWALL confirms

you want to remove it before doing so. Note that subsequent entries

move up by one when you take this action.

#

This is the index number of the MX record.

Domain Name

This is the domain name where the mail is destined for.

IP/FQDN

This is the IP address or Fully-Qualified Domain Name (FQDN) of a mail

server that handles the mail for the domain specified in the field above.

Service Control

This specifies from which computers and zones you can send DNS

queries to the ZyWALL.

Add

Click this to create a new entry. Select an entry and click

Add

to create

a new entry after the selected entry.

Edit

Double-click an entry or select it and click

Edit

to be able to modify the

entry’s settings.

Remove

To remove an entry, select it and click

Remove

. The ZyWALL confirms

you want to remove it before doing so. Note that subsequent entries

move up by one when you take this action.

Move

To change an entry’s position in the numbered list, select the method

and click

Move

to display a field to type a number for where you want

to put it and press [ENTER] to move the rule to the number that you

typed.

#

This the index number of the service control rule. The ordering of your

rules is important as rules are applied in sequence.

The entry with a hyphen (-) instead of a number is the ZyWALL’s (non-

configurable) default policy. The ZyWALL applies this to traffic that does

not match any other configured rule. It is not an editable rule. To apply

other behavior, configure a rule that traffic will match so the ZyWALL

will not have to use the default policy.

Zone

This is the zone on the ZyWALL the user is allowed or denied to access.

Address

This is the object name of the IP address(es) with which the computer

is allowed or denied to send DNS queries.

Action

This displays whether the ZyWALL accepts DNS queries from the

computer with the IP address specified above through the specified

zone (

Accept

) or discards them (

Deny

).

Table 213

Configuration > System > DNS (continued)

LABEL

DESCRIPTION

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Chapter 45 System

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45.5.3

Address Record

An address record contains the mapping of a Fully-Qualified Domain Name (FQDN)

to an IP address. An FQDN consists of a host and domain name. For example,

www.zyxel.com is a fully qualified domain name, where “www” is the host, “zyxel”

is the second-level domain, and “com” is the top level domain.

mail.myZyXEL.com.tw is also a FQDN, where “mail” is the host, “myZyXEL” is the

third-level domain, “com” is the second-level domain, and “tw” is the top level

domain.

The ZyWALL allows you to configure address records about the ZyWALL itself or

another device. This way you can keep a record of DNS names and addresses that

people on your network may use frequently. If the ZyWALL receives a DNS query

for an FQDN for which the ZyWALL has an address record, the ZyWALL can send

the IP address in a DNS response without having to query a DNS name server.

45.5.4

PTR Record

A PTR (pointer) record is also called a reverse record or a reverse lookup record. It

is a mapping of an IP address to a domain name.

45.5.5

Adding an Address/PTR Record

Click the

Add

icon in the

Address/PTR Record

table to add an address/PTR

record.

Figure 387

Configuration > System > DNS > Address/PTR Record Edit

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