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TL-R600VPN SafeStream Gigabit Broadband VPN Router User Guide
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¾ Firewall - Enable the general firewall or not.
• SPI Firewall - SPI (Stateful Packet Inspection) keeps track of the state of network
connections traveling across it. It distinguishes legitimate packets for different types of
connections. Only packets matching a known active connection will be allowed by the
firewall; others will be rejected. SPI Firewall is enabled by factory default. If you want all
the computers on the LAN exposed to the external network, you can disable it.
¾ VPN - VPN Passthrough must be enabled if you want to allow VPN tunnels using VPN
protocols to pass through the router.
• PPTP Passthrough - Check the box before Enable to allow the PPTP tunnels to pass
through the router.
• L2TP Passthrough - Check the box before Enable to allow the L2TP tunnels to pass
through the router.
• IPSec Passthrough - Check the box before Enable to allow the IPSec tunnels to pass
through the router.
¾ ALG - You can determine whether to provide ALG (Application Level Gateway) service for
FTP, TFTP, H323 and RTSP to keep these special applications from the effect of NAT
service.
• FTP ALG - Select Enable to allow FTP services to operate properly.
• TFTP ALG - Select Enable to allow TFTP services to operate properly.
• H323 ALG - Select Enable to allow H323 services to operate properly.
• RTSP ALG - Select Enable to allow RTSP services to operate properly.
4.6.2 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 next screen (shown in Figure 4-26).
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