ZyXEL GS-105I User Guide - Page 174
ALG Settings
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Chapter 11 Network Address Translation (NAT) Note: Use an IPv4 address for the DMZ server. Note: Enter the IP address of the default server in the Default Server Address field, and click Apply to activate the DMZ host. Otherwise, clear the IP address in the Default Server Address field, and click Apply to deactivate the DMZ host. Figure 98 Network Setting > NAT > DMZ The following table describes the fields in this screen. Table 60 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. Cancel Apply Note: If you do not assign a Default Server Address, the Zyxel Device discards all packets received for ports that are not specified in the NAT Port Forwarding screen. Click Cancel to restore your previously saved settings. Click Apply to save your changes. 11.5 ALG Settings Application Layer Gateway (ALG) allows customized NAT traversal filters to support address and port translation for certain applications such as File Transfer Protocol (FTP), Session Initiation Protocol (SIP), or file transfer in Instant Messaging (IM) applications. It allows SIP calls to pass through the Zyxel Device. When the Zyxel Device registers with the SIP register server, 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 your Zyxel Device is behind a SIP ALG. Use this screen to enable and disable the ALGs in the Zyxel Device. To access this screen, click Network Setting > NAT > ALG. PX7511-B0 User's Guide 174