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D-Link M15 User Manual
Section 3 - Configuration
Firewall
Advanced (Continued)
Advanced Settings... - Application Level Gateway (ALG) Configuration
Different ALGs provide special handling for specific protocols or applications.
A number of ALGs for common applications are enabled by default as stated
below.
PPTP
Allows multiple machines on the LAN to connect to their corporate
network using the 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 Application Level Gateway (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 uses Real Time Streaming Protocol (RTSP)
to receive streaming media from the Internet.
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 SIP
ALG (Session Initiation Protocol Application Layer Gateway) may
interfere with the operation of such devices. If you are having trouble
making VoIP calls, try turning this ALG off.
