ZyXEL P-870H-53A v2 User Guide - Page 128
The DMZ Host Screen, The ALG Screen
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Chapter 8 Network Address Translation (NAT) 8.6 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 70 NAT > DMZ Host The following table describes the fields in this screen. Table 41 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. Apply 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. 8.7 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. 128 P-870H/HW Series User's Guide