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SBR-AC1900P: Firewall Setup

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Question
How do I configure the firewall in SBR-AC1900P?  
Answer
The SBR-AC1900P Firewall has various settings related to blocking or exclusively allowing different types of data through the router from the Internet to the home network.  Even if specific web content is allowed on the computer level, it can be blocked on the router / gateway level using the firewall options.  By default, the Firewall is set to Off; it is recommended to be enabled.  This document describes how to setup the SBR-AC1900P firewall.

 
Firewall Setup
  1. Launch a web browser, such as Internet Explorer, Firefox, or Safari.  Enter http://192.168.0.1 into the address box, and press the Enter key.  The Login page will appear.
     
  2. On the Login page, enter admin in the Username field.
     
  3. Enter password in the Password field.
     
  4. Click the Login button.  The Home page will appear.

    Right click on the image to save it to your computer. 
     
  5. Move the mouse-cursor over Firewall on the main menu and click the Protection Level link on the sub-menu.  The Firewall - Protection Level page will appear.  

    User-added image
     
  6. On the Firewall - Protection Level page under the Firewall Protection Level section, click the Firewall Protection Setting drop-down menu and select the level of protection (Low, Medium or High).  The following are descriptions for each option: ​
    • Off - Default setting.  No security, highest risk.  No services are restricted.
    • Low - Minimum security, higher risk.  No services are restricted.
    • Medium - Safe configuration, modest risk.  Port Forwarding and DMZ setup will be blocked and some services are restricted.  Click here to see Allowed Services list.
    • High - Safest configuration, highest security.  Port Forwarding and DMZ setup will be blocked and some services are restricted.  Click here to see Allowed Services list.
  7. Under the Firewall Settings section, check the Block Fragmented IP Packets box to prevent all fragmented IP Packets from passing through the firewall.
     
  8. Check the Port Scan Detection box to detect and block port scan activity from the Internet and in the home network.
     
  9. Check the IP Flood Detection box to detect and block packet floods originating from the Internet and in the home network.    
     
  10. Click the Apply button under the Firewall Protection Level section.  A restart is not required, as the Firewall settings will immediately go into effect.

    Right click on the image to save it to your computer.
Allowed Services List
The following table list the type of services allowed by Firewall Protection levels.
 
Allowed ServicesFirewall Protection
ServicePortProtocolOffLowMediumHigh
AIM / ICQ5190TCPAllowedAllowedAllowedBlocked
DHCPv6546UDPAllowedAllowedAllowedBlocked
DNS53TCP / UDPAllowedAllowedAllowedAllowed
FTP-S989-990UDPAllowedAllowedAllowedBlocked
HTTP80TCPAllowedAllowedAllowedAllowed
HTTP Alternate8080TCPAllowedAllowedAllowedBlocked
HTTP-S443TCPAllowedAllowedAllowedAllowed
IMAP143TCPAllowedAllowedAllowedBlocked
IPSec NAT-T4500TCPAllowedAllowedAllowedAllowed
NTP123UDPAllowedAllowedAllowedAllowed
POP3110TCPAllowedAllowedAllowedBlocked
POP3-S995TCPAllowedAllowedAllowedAllowed
Radius1812TCP / UDPAllowedAllowedAllowedBlocked
SMTP25TCPAllowedAllowedAllowedAllowed
SMTP-S465TCPAllowedAllowedAllowedBlocked
SSH22TCPAllowedAllowedAllowedAllowed
Steam1725UDPAllowedAllowedAllowedBlocked
Steam Friends1200UDPAllowedAllowedAllowedBlocked
Telnet-S992TCPAllowedAllowedAllowedBlocked
XBOX Live3074TCP / UDPAllowedAllowedAllowedBlocked
World of Warcraft3724TCP / UDPAllowedAllowedAllowedBlocked
Yahoo Messenger5050UDPAllowedAllowedAllowedBlocked
Other ServicesAllowedAllowedBlockedBlocked

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