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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 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/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.
H.323 (Netmeeting)
: Allows H.323 (specifically Microsoft Netmeeting) clients to
communicate across NAT 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.