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Chapter 11 Network Address Translation (NAT)
VMG/XMG Series User’s Guide
241
Figure 146 Network Setting > NAT > ALG
The following table describes the fields in this screen.
11.6 The Address Mapping Screen
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.
Click Network Setting > NAT > Address Mapping to display the following screen.
Figure 147 Network Setting > NAT > Address Mapping
Table 83 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 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 Enable this to turn on the PPTP ALG on the VMG 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 VMG to detect IPsec traffic and help build IPsec
sessions through the Zyxel Device’s NAT.
Cancel Click Cancel to restore your previously saved settings.
Apply Click Apply to save your changes.
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