PLANET WNAP-7206 - Manual (Page 120)

User Manual of WNAP-7206
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 ALG
It is recommended to enable Application Layer Gateway (ALG)
because ALG allows customized Network Address Translation
(NAT) traversal filters to be plugged into the gateway to support
address and port translation for certain application layer
"control/data" protocols such as FTP, TFTP, H323 etc.
The page includes the following fields:
Object Description
Firewall
 SPI Firewall
Stateful Packet Inspection (SPI) helps to prevent cyber attacks by
tracking more state per session. It validates that the traffic passing
through the session conforms to the protocol. SPI Firewall is
enabled by factory default. If you want all the computers on the
LAN exposed to the outside world, you can disable it.
VPN
 PPTP Passthrough
PPTP Passthrough. Point-to-Point Tunneling Protocol (PPTP)
allows the Point-to-Point Protocol (PPP) to be tunneled through an
IP network. To allow PPTP tunnels to pass through the Router, click
Enable.
 L2TP Passthrough
Layer Two Tunneling Protocol (L2TP) is the method used to enable
Point-to-Point sessions via the Internet on the Layer Two level. To
allow L2TP tunnels to pass through the Router, click Enable.
 IPSec Passthrough
Internet Protocol security (IPSec) is a suite of protocols for
ensuring private, secure communications over Internet Protocol
(IP) networks, through the use of cryptographic security services.
To allow IPSec tunnels to pass through the Router, click Enable.
ALG
 FTP ALG
To allow FTP clients and servers to transfer data across NAT, click
Enable.
 TFTP ALG
To allow TFTP clients and servers to transfer data across NAT, click
Enable.
 H323 ALG
To allow Microsoft NetMeeting clients to communicate across NAT,
click Enable.
 Save Click the Save button to save the settings.