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III-3-5.
WAN Security
SPI firewall
Enable or disable the stateful packet inspection (SPI)
firewall.
VPN
Supports enable/disable PPTP passthrough, L2TP
passthrough and IPSec Passthrough
ALG
Application Layer Gateway (ALG) is a network
security gateway which supports specific network
applications such as gaming and instant messaging.
ALG enables these applications to communicate with
their server.
Supports enable/disable FTP ALG and TFTP ALG
DNS Settings
Enable/Disable DNS Settings