ASUS 4G-AC55U User Manual

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4.3.8  NAT Passthrough
NAT Passthrough allows a Virtual Private Network (VPN) 
connection to pass through the router to the network clients. 
PPTP Passthrough, L2TP Passthrough, IPsec Passthrough and RTSP 
Passthrough are enabled by default.
To enable / disable the NAT Passthrough settings:
1.  Go to the Advanced Settings > WAN > NAT Passthrough 
tab. 
2. Select 
Enable or Disable  for specific traffic pass through the 
NAT firewall.
3.  When done, click Apply