ZyXEL P-660RU-T1 User Guide - Page 159
NAT Technical Reference
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Chapter 9 Network Address Translation (NAT) Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access this screen, click Network > NAT > ALG. Figure 67 Network > NAT > ALG The following table describes the fields in this screen. Table 46 Network > NAT > ALG LABEL DESCRIPTION Enable SIP ALG Select this to make sure SIP (VoIP) works correctly with port-forwarding and addressmapping rules. Apply Click this to save your changes. Reset Click this to restore your previously saved settings. 9.6 NAT Technical Reference This chapter contains more information regarding NAT. 9.6.1 NAT Definitions Inside/outside denotes where a host is located relative to the ZyXEL Device, for example, the computers of your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts. Global/local denotes the IP address of a host in a packet as the packet traverses a router, for example, the local address refers to the IP address of a host when the packet is in the local network, while the global address refers to the IP address of the host when the same packet is traveling in the WAN side. Note that inside/outside refers to the location of a host, while global/local refers to the IP address of a host used in a packet. Thus, an inside local address (ILA) is the IP address of an inside host in a packet when the packet is still in the local network, while an inside global address (IGA) is the IP address of the same inside host when the packet is on the WAN side. The following table summarizes this information. Table 47 NAT Definitions ITEM DESCRIPTION Inside This refers to the host on the LAN. Outside This refers to the host on the WAN. ADSL Router Series User's Guide 159