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L2TP 
The 
Layer 2 Tunneling Protocol 
(L2TP) is a Layer2 tunneling protocol for implementing virtual 
private networks. 
L2TP does not provide confidentiality or strong authentication by itself.
IPsec is often used to secure 
L2TP packets by providing confidentiality, authentication and integrity. The combination of these two 
protocols is generally known as L2TP/IPsec
. 
In L2TP section, both pure L2TP and L2TP/IPSec are supported. Users can choose your preferable 
option for your own needs. 
Note: 
4 sessions for Client and only one for Server respectively. 
L2TP Server 
In L2TP session, users can set the bassic parameters(authentication, encyption, peer address, etc) 
for L2TP Server, and accounts in the page of VPN Account. They both constitutes the complete 
L2TP Server settings. 
L2TP: 
Select 
Enable 
to activate L2TP Server. 
Disable 
to deactivate L2TP Server. 
WAN Interface: 
Select the exact WAN interface configured as source for the tunnel. Select different 
interfaces, you will decide whether to use L2TP over IPSec or the pure L2TP. 
L2TP over IPSec
, Select “Default or IPSec Tunnel” only when there is IPSec for L2TP rule in 
place. 
Pure L2TP
, Select Default (there is no IPSec for L2TP in place) or other interface to activate 
the pure L2TP.
Auth. Type: 
The authentication type, Pap or Chap, PaP, Chap. When using PAP, the password is 
sent unencrypted, whilst CHAP encrypts the password
before sending, and also allows for 
challenges at different periods to ensure that an intruder has
not replaced the client. 
IP Addresses Assigned to Peer: 
192.168.1.x: please input the IP assigned range from 1~ 254. 
Tunnel Authentication: 
Select whether to enable L2TP tunnel authentication. Enable it if needed 
 19216811.live
19216811.live