User's Manual

 The router supports up to 16 Port Triggering entries. Each entry supports at most 5 groups of
trigger ports and overlapping between the ports is not allowed.
 Each entry supports at most 5 groups of incoming ports and the sum of incoming ports you set for
each entry should not be more than 100.
 List of Rules
In this table, you can view the information of the entries and edit them by the Action buttons.
The first entry in Figure 3-38 indicates that: This is a Port Triggering entry named host1, When the
LAN host initiates a TCP request via port of 5354, and the incoming port 5355 of WAN1 will open
for TCP and UDP protocol. This entry is activated.
3.4.1.6 ALG
Some special protocols such as FTP, H.323, SIP, IPsec and PPTP will work properly only when ALG
(Application Layer Gateway) service is enabled.
Choose the menu Advanced→NAT→ALG to load the following page.
Figure 3-39 ALG
The following items are displayed on this screen:
 ALG
FTP ALG:
Enable or disable FTP ALG. The default setting is enabled
. It is
recommended to keep the default setting if no special requirement.
H.323 ALG:
Enable or disable H.323 ALG. The default setting is enabled. H.323 is
used for various applications such as NetMeeting and VoIP.
SIP ALG:
Enable or disable SIP ALG. The default setting is enabled
. It is
recommended to keep the default setting if no special requirement.
IPsec ALG:
Enable or disable IPsec ALG. The default setting is enabled
. It is
recommended to keep default if no special requirement.
PPTP ALG:
Enable or disable PPTP ALG. The default setting is enabled.
It is
recommended to keep default if no special requirement.
-63-