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G2wifi II User’s Manual
Copyright of 3JTech Co., Ltd. (also doing business as A3J Engineering Inc.)
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3.2.2 Special Applications
Application Level Gateway (ALG) Configurations:
Here you can enable or disable ALGs. Some protocols and applications require special handling of
the IP payload to make them work with network address translation (NAT). Each ALG provides
special handling for a specific protocol or application. A number of ALGs for common applications are
enabled by default.
PPTP:
Allows multiple machines on the LAN to connect to their corporate network using PPTP
protocol.
IPSec VPN:
Allows multiple VPN clients to connect to their corporate network using IPSec.
Some VPN clients support traversal of IPSec through NAT. This ALG may interfere with the
operation of such VPN clients. If you are having trouble connecting with your corporate network,
try turning this ALG off. Please check with the system administrator of your corporate network
whether your VPN client supports NAT traversal.
RTSP:
Allows applications that use Real Time Streaming Protocol to receive streaming media
from the internet. QuickTime and Real Player are some of the common applications using this
protocol.
Windows Messenger:
Supports use of Microsoft Windows Messenger (the Internet
messaging client that ships with Microsoft Windows) on LAN computers. The SIP ALG must
also be enabled when the Windows Messenger ALG is enabled.
FTP:
Allows FTP clients and servers to transfer data across NAT. Refer to the
Advanced ->
Virtual Server
page if you want to host an FTP server.
NetMeeting:
Allows Microsoft NetMeeting clients to communicate across NAT. Note that if you
want your buddies to call you, you should also set up a virtual server for NetMeeting. Refer to
the
Advanced -> Virtual Server
page for information on how to set up a virtual server.
SIP:
Allows devices and applications using VoIP (Voice over IP) to communicate across NAT.
Some VoIP applications and devices have the ability to discover NAT devices and work around
them. This ALG may interfere with the operation of such devices. If you are having trouble
making VoIP calls, try turning this ALG off.