Chapter 11 Network Address Translation (NAT)
EMG6726/8726-B10A User’s Guide
163
The following table describes the fields in this screen.
11.7 The Address Mapping Screen
Ordering your rules is important because the EMG applies the rules in the order that you specify. When a
rule matches the current packet, the EMG takes the corresponding action and the remaining rules are
ignored.
Click
Network Setting > NAT > Address Mapping
to display the following screen.
Figure 101
Network Setting > NAT > Address Mapping
The following table describes the fields in this screen.
Table 58 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 EMG 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 EMG to detect PPTP traffic and help build PPTP
sessions through the EMG’s NAT.
IPSEC ALG
Enable this to turn on the IPSec ALG on the EMG to detect IPSec traffic and help build IPSec
sessions through the EMG’s NAT.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 59 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.
