TP-LINK TL-MR3420 User Manual

 

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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, Enable. 

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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, Enable. 

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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, Enable. 

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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, RTSP etc.   

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FTP ALG - Select Enable, to allow FTP servers to operate properly. 

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TFTP ALG - Select Enable, to allow TFTP servers to operate properly. 

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H323 ALG - Select Enable, to allow H323 services to operate properly. 

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RTSP ALG - Select Enable, to allow RTSP services to operate properly. 

Click the Save button to save your settings. 

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 

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