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Security
SPI Firewall
Enable DoS (Denial of Service) Firewall
Threshold: High (WAN bandwidth > 2 Mbps)
  Medium (WAN bandwidth 1 - 2 Mbps)
  Low (WAN bandwidth < 1 Mbps)
If Enabled (recommended), invalid packets and connections are dropped. The "Threshold" affects invalid connections only.
Options
  Respond to ICMP (ping) on WAN interface
  Allow IPsec
  Allow PPTP
  Allow L2TP
  Allow TFTP firmware upgrade