Chapter 11 Firewall
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domain name.
When the filter type is DNS filtering, the filtering conditions available for setting include: source
address, filtering content (refers to the domain names to be filtered), action, effective time period.
Tip: DNS filtering is implemented through Port 53, while URL filtering is implemented
through Port 80.
The actions of access control policy include forwarding and discarding, and the corresponding
"actions" are "allow" or "disallow". When the packets to be processed match a defined access
control policy, and if the "action" of the policy is "allow", then the device will forward the packet.
If the "action" of the policy is "disallow", the device will discard the packet.
What needs to be aware of is that keyword filtering does not provide any "action" options, but
"disallow" by default due to its special application.
11.2.2 Access control list
Drag the cross bar below the access control policy list, to view the detailed information of
instances.
Figure 11_3 Access control list
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