The Dmz Host Screen; The Alg Screen - ZyXEL Communications P-870HN-51B - V1.0 Manual

Chapter 8 Network Address Translation (NAT)

8.5 The DMZ Host Screen

In addition to the servers for specified services, NAT supports a default server IP
address. A default server receives packets from ports that are not specified in the
NAT Port Forwarding Setup screen.
Figure 72 NAT > DMZ Host
The following table describes the fields in this screen.
Table 41 NAT > DMZ Host
LABEL
Default Server
Apply

8.6 The ALG Screen

Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG
allows SIP calls to pass through NAT by examining and translating IP addresses
embedded in the data stream. The SIP ALG translates the ZyXEL Device's private
IP address inside the SIP data stream to a public IP address. You do not need to
use STUN or an outbound proxy if you enable the SIP ALG.
142
DESCRIPTION
Enter the IP address of the default server which receives packets from
ports that are not specified in the NAT Port Forwarding screen.
Note: If you do not assign a Default Server, the ZyXEL Device
discards all packets received for ports that are not specified
in the NAT Port Forwarding screen.
Click Apply to save your changes back to the ZyXEL Device.
P-870HN-51b User's Guide