User`s manual

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Page 43 de 67
The following table describes the parameters of this page.
Field
Description
Classify Type
Set the QoS rule type as Upstream or Downstream.
Enable
Tick in the box to enable this QoS rule.
Ip Protocol Type
Select the protocol type IPv4.
Input Interface
Based on the Classify Type, choose a WAN/LAN interface.
802.1P
Choose a matched 802.1P VLAN priority.
DSCP Check
Choose a matched DSCP type.
Protocol Type
Choose a protocol type matching with the QoS rule.
Classify Queue
Choose a QoS queue for the rule.
DSCP Mark
Set a DSCP Mark for this QoS rule.
You may click Edit to modify the existing classification rule.
3.3.9 Firewall Settings
A denial-of-service (DoS) attack is characterized by an explicit attempt by attackers to prevent legitimate
users of a service from using that service.
Port scan protection is designed to block attempts to discover vulnerable ports or services that might be
exploited in an attack from the WAN.
Choose Advanced > Firewall Settings. The page shown in the following figure appears.
Figure 55
Click Apply to save the settings.
3.3.10 DNS
Domain name system (DNS) is an Internet service that translates domain names into IP addresses. Because
domain names are alphabetic, they are easier to remember. The Internet, however, is actually based on IP
addresses. Each time you use a domain name, a DNS service must translate the name into the corresponding
IP address. For example, the domain name www.example.com might be translated to 198.105.232.4.
The DNS system is, in fact, its own network. If one DNS server does not know how to translate a particular
domain name, it asks another one, and so on, until the correct IP address is returned.
Choose Advanced > DNS. The page shown in the folllowin g figure appears.