Справочник Пользователя для ASUS RT-AC66U

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4.6  Firewall
The wireless router can serve as a hardware firewall for your 
network. 
NOTE:  The Firewall feature is enabled by default.
4.6.1 General
To set up basic Firewall settings:
1.  From the navigation panel, go to Advanced Settings > 
Firewall General tab.
2.  On the Enable Firewall field, select Yes.
3.  On the Enable DoS protection, select Yes to protect your 
network from DoS (Denial of Service) attacks though this may 
affect your router’s performance. 
4.  You can also monitor packets exchanged between the LAN 
and WAN connection. On the Logged packets type, select 
DroppedAccepted, or Both.
5.  Click Apply.
4.6.2 URL Filter
You can specify keywords or web addresses to prevent access to 
specific URLs.
NOTE:  The URL Filter is based on a DNS query. If a network client has 
already accessed a website such as http://www.abcxxx.com, then the 
website will not be blocked (a DNS cache in the system stores previously 
visited websites). To resolve this issue, clear the DNS cache before 
setting up the URL Filter.
To set up a URL filter:
1.  From the navigation panel, go to Advanced Settings > 
Firewall URL Filter tab.
2.  On the Enable URL Filter field, select Enabled.
3.  Enter a URL and click the 
button.
4.  Click Apply.