TP-Link TL-WR841N User Manual page 46

Chapter 4
• Firewall
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• VPN
PPTP or L2TP protocols to pass through the router's firewall.
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• ALG
allows customized Network Address Translation (NAT) traversal filters to be plugged
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- A firewall protects your network from Internet attacks.
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 default.
- VPN Passthrough must be enabled if you want to allow VPN tunnels using IPSec,
PPTP Passthrough - Point-to-Point Tunneling Protocol (PPTP) allows the Point-
to-Point Protocol (PPP) to be tunneled through an IP network. If you want
to allow PPTP tunnels to pass through the router, you can keep the default
(Enabled).
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. If you want
to allow L2TP tunnels to pass through the router, you can keep the default
(Enabled).
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. If you want to allow IPSec
tunnels to pass through the router, you can keep the default (Enabled).
- It is recommended to enable Application Layer Gateway (ALG) because ALG
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