User Manual NRP1000 Series IP Phone
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Name Description
Deletes an input or output rule as needed.
5.9.3 NAT
NAT Settings
Net Address Translation (NAT) is an IP address translation (IP address mapping) protocol. It is used to
transform the private IP address and port to public IP address and port.
DMZ Settings
Some intranet devices need to provide extranet services. To ensure that these devices can provide better
services and the internal network is safe, you need to isolate devices with extranet services from others
as needed. The DMZ setting help you build a DMZ to protect devices at the network level, reducing the
security risk caused by providing service to unauthorized user.
Figure 5-37 NAT setting interface
Table 5-31 NAT parameters setting
Name Description
Application Layer Gateway (ALG) Settings
IPSec ALG
Enables/disables IPSec ALG, an encryption/decryption technology. By default, IPSec ALG is
enabled.
FTP ALG
Enables/disables FTP ALG, a connection-layer service used to transform the intranet IP of the
packet into an extranet IP.
By default, FTP ALG is enabled.
