ZyXEL Communications P-870HN-5xb - The ALG Screen; The DMZ Host Screen

Chapter 8 Network Address Translation (NAT)
P-870HN-5xb User’s Guide
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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 76 NAT > DMZ Host
The following table describes the fields in this screen.
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 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.
Table 44 NAT > DMZ Host
LABEL DESCRIPTION
Default Server 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 Device discards all
packets received for ports that are not specified in the NAT
Port Forwarding screen.
Apply Click Apply to save your changes back to the Device.