ZyXEL VMG4927-B50A User Guide - Page 165
NAT Port Forwarding Setup, Network Setting, > NAT > ALG, LABEL,
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Chapter 11 Network Address Translation (NAT) 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 87 Network Setting > NAT > DMZ The following table describes the fields in this screen. Table 59 Network Setting > NAT > DMZ LABEL DESCRIPTION Default Server Address Enter the IP address of the default server which receives packets from ports that are not specified in the NAT Port Forwarding screen. Apply Cancel Note: If you do not assign a Default Server Address, the VMG discards all packets received for ports that are not specified in the NAT Port Forwarding screen. Click Apply to save your changes. Click Cancel to restore your previously saved settings. 11.6 ALG 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. When the VMG registers with the SIP register server, the SIP ALG translates the VMG'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 your VMG is behind a SIP ALG. Use this screen to enable and disable the ALGs in the VMG. To access this screen, click Network Setting > NAT > ALG. Figure 88 Network Setting > NAT > ALG VMG4927-B50A / VMG9827-B50A User's Guide 165