Security > VPN Passthrough 
Use this page to configure Virtual Private Network (VPN) support. Enabling the 
settings on this page allows VPN tunnels using IPsec or PPTP protocols to pass 
through the gateway's firewall. Select the VPN Passthrough tab to open the Security 
VPN Passthrough page. 
 
Use the descriptions and instructions in the following table to configure the VPN 
passthrough for your residential gateway. After you make your selections, click Save 
Settings to apply your changes or Cancel Changes to cancel. 
IPSec Passthrough 
Enables/disables Internet Protocol Security (IPsec). IPsec is a suite of 
protocols used to implement secure exchange of packets at the IP layer. If 
you enable IPSec Passthrough, applications that use IPsec (IP Security) can 
pass through the firewall. To disable IPSec Passthrough select Disable. 
Select the desired option: 
  Enable (factory default) 
  Disable 
PPTP Passthrough 
Enables/disables Point-to-Point Tunneling Protocol (PPTP). PPTP allows the 
Point-to-Point Protocol (PPP) to be tunneled through an IP network. If you 
enable PPTP passthrough, applications that use Point to Point Tunneling 
Protocol (PPTP) can pass through the firewall To disable PPTP Passthrough 
select Disable. 
Select the desired option: 
  Enable (factory default) 
  Disable