Kyocera KR2 User Manual page 30

Application Level Gateway (ALG) Configuration
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 networks using PPTP
protocol. When the PPTP ALG is enabled, LAN computers can establish PPTP VPN
connections either with the same or with different VPN servers. When the PPTP ALG is
disabled, the router allows VPN operation in a restricted way -- LAN computers are
typically able to establish VPN tunnels to different VPN Internet servers but not to the
same server. The 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 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.
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