ZyXEL Communications PMG2006-T20A, User Manual

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Chapter 9 Network Address Translation (NAT)
PMG2006-T20A User’s Guide
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The following table describes the fields in this screen.
9.7 The Address Mapping Screen
You can map local addresses to global addresses in the following screen. For more information about
local addresses and global addresses, see
Section 9.9.1 on page 83 .
Ordering your rules is important because the PMG2006-T20A applies the rules in the order that you
specify. When a rule matches the current packet, the PMG2006-T20A takes the corresponding action
and the remaining rules are ignored.
Click Network Setting > NAT > Address Mapping to display the following screen.
Figure 47 Network Setting > NAT > Address Mapping
The following table describes the fields in this screen.
Table 31 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 PMG2006-T20A 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 PMG2006-T20A to detect PPTP traffic and help build
PPTP sessions through the PMG2006-T20A’s NAT.
IPSEC ALG
Enable this to turn on the IPsec ALG on the PMG2006-T20A to detect IPsec traffic and help build
IPsec sessions through the PMG2006-T20A’s NAT.
Apply Click Apply to save your changes.
Cancel Click Cancel to restore your previously saved settings.
Table 32 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-to-
One mapping types.