Ursalink UR51 Industrial Cellular Router User Guide
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<strong>UR51</strong> <strong>User</strong> <strong>Guide</strong><br />
4.2.2 Firewall<br />
This section describes how to set the firewall parameters, including ACL, DMZ, Port Mapping<br />
and MAC Binding.<br />
The firewall implements corresponding control of data flow at entry direction (from Internet<br />
to local area network) and exit direction (from local area network to Internet) according to<br />
the content features of packets, such as protocol style, source/destination IP address, etc. It<br />
ensures that the router operate in a safe environment and host in local area network.<br />
4.2.2.1 ACL<br />
Access control list, also called ACL, implements permission or prohibition of access for<br />
specified network traffic (such as the source IP address) by configuring a series of matching<br />
rules so as to filter the network interface traffic. When router receives packet, the field will<br />
be analyzed according to the ACL rule applied to the current interface. After the special<br />
packet is identified, the permission or prohibition of corresponding packet will be<br />
implemented according to preset strategy.<br />
The data package matching rules defined by ACL can also be used by other functions<br />
requiring flow distinction.<br />
Figure 4-2-2-1<br />
Figure 4-2-2-2<br />
Item<br />
ACL Setting<br />
Default Filter Policy<br />
Access Control List<br />
Type<br />
Description<br />
Select from "Accept" and "Deny".<br />
The packets which are not included in the access control list will<br />
be processed by the default filter policy.<br />
Select type from "Extended" and "Standard".<br />
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