Users Manual Part 2

Chapter 12 Network Address Translation (NAT)
NBG7510 User’s Guide
170
Figure 101 Network Setting > NAT > ALG
The following table describes the fields in this screen.
12.6 Address Mapping
Address mapping can map local IP Addresses to global IP addresses. Ordering your rules is important
because the Zyxel Device applies the rules in the order that you specify. When a rule matches the
current packet, the Zyxel Device takes the corresponding action and the remaining rules are ignored.
Use this screen to enable or disable the NAT Address Mapping in the Zyxel Device.
12.6.1 Address Mapping Screen
Click Network Setting > NAT > Address Mapping to open the Address Mapping screen.
Table 61 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 Click this (switch turns blue) to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules. Otherwise, click this to turn off (switch turns gray) the SIP ALG.
RTSP ALG Enable this to have the Zyxel Device 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 Click this to turn on (switch turns blue) the PPTP ALG on the Zyxel Device to detect PPTP traffic
and help build PPTP sessions through the Zyxel Device’s NAT.
IPSEC ALG Enable this to turn on the IPsec ALG on the Zyxel Device to detect IPsec traffic and help build
IPsec sessions through the Zyxel Device’s NAT.
Apply Click Apply to save your changes back to the Zyxel Device.
Cancel Click Cancel to restore your previously saved settings.