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Chapter 6 
Security Configuration 
194 
4036168 Rev B 
Removing a URL Filter 
To remove a URL filter from the firewall, complete the following steps. 
1
Click 
Security 
on the main screen. The MAC Filtering screen opens by default. 
2
Click the 
Firewall
tab. The Filtering Function screen opens by default. 
3
Click the 
URL Filter 
tab. The URL Filtering Function screen opens. 
 
                 
                                
                    
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URL Filtering Function 
4036168 Rev B 
195 
4
Click 
Enable URL Filtering Function
. The URL Filtering Function screen 
updates with blank fields for entering the URLs that you want to block. 
5
Click 
Del
next to each rule that you want to delete. If you want to remove all the 
rules, click 
Remove All
. 
6
Click 
Save
. 
 
                 
                                
                    
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Chapter 6 
Security Configuration 
196 
4036168 Rev B 
Stateful Packet Inspection 
The Stateful Packet Inspection screen allows the gateway to inspect packets passing 
through it to deny network attacks. 
Path
: 
Security > Firewall > Stateful Packet Inspection 
 
                 
                                
                    
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Stateful Packet Inspection 
4036168 Rev B 
197 
Enabling Stateful Packet Inspection 
To enable stateful packet inspection (SPI), complete the following steps. 
1
Click 
Security 
on the main screen. The MAC Filtering screen opens by default. 
2
Click the 
Firewall
tab. The Filtering Function screen opens by default. 
 
                 
                                
                    
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Chapter 6 
Security Configuration 
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4036168 Rev B 
3
Click the 
Stateful Packet Inspection 
tab. The Intrusion Detection screen opens. 
4
Select the 
Enable SPI, Hacker Pattern and Anti-Dos Firewall 
field. 
5
Select the 
Enable Email Alert
field and fill in the email address and SMTP server 
address that you want to notify when the DSL must be rebooted. 
6
Click 
Save/Apply 
to enable stateful packet inspection.