ZyXEL Communications Unified Security Gateway ZyWALL 300, User Manual

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Chapter 50 System
ZyWALL USG 300 User’s Guide
825
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 239 Configuration > System > DNS (continued)
LABEL DESCRIPTION