Basic Security - TP-Link TL-WR740N User Manual

4.10.1 Basic Security

Choose menu "Security → Basic Security", and then you can configure the basic security in
the screen as shown in Figure 4-41.
Firewall - A firewall protects your network from the outside world. Here you can enable or

disable the Router's firewall.
SPI Firewall - SPI (Stateful Packet Inspection, also known as dynamic packet filtering)
•
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 - VPN Passthrough must be enabled if you want to allow VPN tunnels using VPN

protocols to pass through the Router.
PPTP Passthrough - Point-to-Point Tunneling Protocol (PPTP) allows the
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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
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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 - It is recommended to enable Application Layer Gateway (ALG) because ALG allows

customized Network Address Translation (NAT) traversal filters to be plugged into the
TL-WR740N/TL-WR741ND
Figure 4-41 Basic Security
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150Mbps Wireless N Router