TP-LINK AC1750 User Manual

81

Chapter 12

Specify Your Network Settings

If Ping proceeds successfully (gets replies from host in Site B), 

the IPSec connection is working properly now.

Now IPSec VPN is implemented to establish a connection.

1.  The product supports a maximum of ten simultaneous connections.
2.  If one of the site has been off line for a while, for example, if Site A has been disconnected, on Site B you need to 

click 

Disable

 and then click 

Enable

 after Site A back on line in order to re-establish the IPSec tunnel.

The IPv6 Tunnel feature helps you obtain IPv6 resources based on an IPv4 WAN 
connection or vice versa.
IPv6 Tunnel is a transition mechanism that enables IPv6-only hosts to reach IPv4 
services or vice versa and allows isolated IPv6 hosts and networks to reach each other 
over IPv4-only infrastructure before IPv6 completely supplants IPv4. It is a temporary 
solution for networks that do not support native dual-stack, where both IPv6 and IPv4 
run independently.
The modem router provides three tunneling mechanisms: 

6to4

, 

6rd

 and 

DS-Lite

. The 

way to set up 6rd and DS-Lite tunnel are similar.

The 6to4 tunnel is a kind of public service. If there is any 6to4 server in your network, 
you can use this mechanism to access IPv6 service. If your ISP provides you with an 
IPv4-only connection but you want to visit IPv6 websites, you can try to set up a 6to4 
tunnel.