User Manual

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advantage of disabling the PPTP ALG is to increase VPN performance. Enabling the PPTP
ALG also allows incoming VPN connections to a LAN side VPN server (refer to
Advanced →
Virtual Server).
IPSec (VPN)
Allows multiple VPN clients to connect to their corporate networks using IPSec. Some VPN
clients support traversal of IPSec through NAT. This option may interfere with the operation of
such VPN clients. If you are having trouble connecting with your corporate network, try
disabling this option.
Check with the system adminstrator of your corporate network whether your VPN client
supports NAT traversal.
Note that L2TP VPN connections typically use IPSec to secure the connection. To achieve
multiple VPN pass-through in this case, the IPSec ALG must be enabled.
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/MSN Messenger
Supports use on LAN computers of Microsoft Windows Messenger (the Internet messaging
client that ships with Microsoft Windows) and MSN Messenger. 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.
H.323 (Netmeeting)
Allows H.323 (specifically 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.
Wake-On-LAN
This feature enables forwarding of "magic packets" (that is, specially formatted wake-up
packets) from the WAN to a LAN computer or other device that is "Wake on LAN" (WOL)
capable. The WOL device must be defined as such on the Advanced → Virtual Server page.
The LAN IP address for the virtual server is typically set to the broadcast address
192.168.0.255. The computer on the LAN whose MAC address is contained in the magic
packet will be awakened.
MMS
Allows Windows Media Player, using MMS protocol, to receive streaming media from the
internet.