ZyXEL VMG4927-B50A User Guide - Page 166
Address Mapping
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Chapter 11 Network Address Translation (NAT) The following table describes the fields in this screen. Table 60 Network Setting > NAT > ALG LABEL DESCRIPTION NAT ALG Enable this to make sure applications such as FTP and file transfer in IM applications work correctly with port-forwarding and address-mapping rules. SIP ALG Enable this to make sure SIP (VoIP) works correctly with port-forwarding and address-mapping rules. RTSP ALG Enable this to have the VMG detect RTSP traffic and help build RTSP sessions through its NAT. The Real Time Streaming (media control) Protocol (RTSP) is a remote control for multimedia on the Internet. PPTP ALG Enable this to turn on the PPTP ALG on the VMG to detect PPTP traffic and help build PPTP sessions through the VMG's NAT. IPSEC ALG Enable this to turn on the IPsec ALG on the VMG to detect IPsec traffic and help build IPsec sessions through the VMG's NAT. Apply Click Apply to save your changes. Cancel Click Cancel to restore your previously saved settings. 11.7 Address Mapping Ordering your rules is important because the VMG applies the rules in the order that you specify. When a rule matches the current packet, the VMG takes the corresponding action and the remaining rules are ignored. Click Network Setting > NAT > Address Mapping to display the following screen. Figure 89 Network Setting > NAT > Address Mapping The following table describes the fields in this screen. Table 61 Network Setting > NAT > Address Mapping LABEL DESCRIPTION Add New Rule Click this to create a new rule. Rule Name This show the name of the rule. Local Start IP This is the starting Inside Local IP Address (ILA). Local End IP This is the ending Inside Local IP Address (ILA). If the rule is for all local IP addresses, then this field displays 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local End IP address. This field is blank for One-to-One mapping types. Global Start IP This is the starting Inside Global IP Address (IGA). Enter 0.0.0.0 here if you have a dynamic IP address from your ISP. You can only do this for the Many-to-One mapping type. Global End IP This is the ending Inside Global IP Address (IGA). This field is blank for One-to-One and Many-toOne mapping types. VMG4927-B50A / VMG9827-B50A User's Guide 166