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TL-WR841N/TL-WR841ND
300Mbps Wireless N Router
-56-
z L2TP Passthrough - Layer 2 Tunneling Protocol (L2TP) is the method used to enable
Point-to-Point sessions via the Internet on the Layer 2 level. To allow L2TP tunnels to
pass through the router, keep the default, Enabled.
z 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, keep the default, Enabled.
¾ 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.
z FTP ALG - To allow FTP clients and servers to transfer data across NAT, keep the
default Enable.
z TFTP ALG - To allow TFTP clients and servers to transfer data across NAT, keep the
default Enable.
z H323 ALG - To allow Microsoft NetMeeting clients to communicate across NAT, keep
the default Enable.
z RTSP ALG - To allow some media player clients to communicate with some streaming
media servers across NAT, click Enable.
Click the Save button to save your settings.
4.9.2 Advanced Security
Choose menu “Security → Advanced Security”, you can protect the router from being attacked
by TCP-SYN Flood, UDP Flood and ICMP-Flood in the screen as shown in
Figure 4-39.