ZyXEL VMG3925-B10B User Guide - Page 161
The DMZ Screen, The ALG Screen
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Chapter 11 Network Address Translation (NAT) Table 60 Port Triggering: Configuration Add/Edit (continued) LABEL Open Start Port DESCRIPTION The open port is a port (or a range of ports) that a server on the WAN uses when it sends out a particular service. The VMG forwards the traffic with this port (or range of ports) to the client computer on the LAN that requested the service. Open End Port Open Protocol OK Cancel Type a port number or the starting port number in a range of port numbers. Type a port number or the ending port number in a range of port numbers. Select the transport layer protocol from TCP, UDP, or TCP/UDP. Click OK to save your changes. Click Cancel to exit this screen without saving. 11.5 The DMZ 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 83 Network Setting > NAT > DMZ The following table describes the fields in this screen. Table 61 Network Setting > NAT > DMZ LABEL DESCRIPTION Default Server Enter the IP address of the default server which receives packets from ports that are not Address 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 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. 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 NAT and SIP (VoIP) ALG in the VMG. To access this screen, click Network Setting > NAT > ALG. VMG3925-B10B User's Guide 161