4.1.15 IP Tunnel 
This section explains the following information: 
• IPv6inIPv4 
• IPv4inIPv6 
IPv6inIPv4 
Click IPv6inIPv4 and Add to enter the following screen: 
 
  Tunnel Name: Specify the name of the tunnel.  
  Mechanism: Currently, only DS-Lite configuration is supported.     
  Associated WAN Interface: Specify the WAN iterface of the tunnel.   
  Associated LAN Interface: Specify the LAN iterface of the tunnel.   
  Manual: If you select Manual, configure the following settings also: 
  IPv4 Mask Length: Specify the IPv4 Mask Length. 
  6rd Prefix with Prefix Length: Specify the 6rd Prefix with Prefix Length. 
  Border Relay IPv4 Address: Specify the Border Relay IPv4 Address. 
  Automatic: If Automatic is selected, no configurations are required. 
  Apply/Save: Click to apply and save your settings. 
IPv4inIPv6 
Click IPv4inIPv6 and Add to enter the following screen: