UR75 User Guide
44
Figure 4-2-1-16
Loopback
Item
Description
Default
IP Address
Unalterable
127.0.0.1
Netmask
Unalterable
255.0.0.0
Multiple IP
Addresses
Apart from the IP above, user can configure other
IP addresses.
Null
Table 4-2-1-16 Loopback Parameters
4.2.2 Firewall
This section describes how to set the firewall parameters, including ACL, DMZ, Port Mapping and MAC
Binding.
The firewall implements corresponding control of data flow at entry direction (from Internet to local area
network) and exit direction (from local area network to Internet) according to the content features of
packets, such as protocol style, source/destination IP address, etc. It ensures that the router operate in a
safe environment and host in local area network.
4.2.2.1 ACL
Access control list, also called ACL, implements permission or prohibition of access for specified network
traffic (such as the source IP address) by configuring a series of matching rules so as to filter the network
interface traffic. When router receives packet, the field will be analyzed according to the ACL rule
applied
to the current interface. After the special packet is identified, the permission or prohibition of
corresponding packet will be implemented according to preset strategy.
The data package matching rules defined by ACL can also be used by other functions requiring flow
distinction.
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