TP-LINK TL-WR740N Manuel D’Utilisation

 

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as shown in Figure 4-38. 

 

Figure 4-38 Basic Security 

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Firewall - A firewall protects your network from the outside world. Here you can enable or 

disable the Router’s firewall. 

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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.   

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VPN - VPN Passthrough must be enabled if you want to allow VPN tunnels using IPSec, 

PPTP, or L2TP protocols to pass through the Router’s firewall. 

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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, keep the default, Enabled.  

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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. 

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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. 

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ALG - It is recommended to enable Application Layer Gateway (ALG) because ALG allows