L2TP VPN  
 
Force MPPE Encryption: enable or disable force MPPE encryption of L2TP data 
Server IP: Input tunnel IP address of the router PPTP server interface – this must 
be on a different subnet to modem LAN 
Client IP(s): IP address assigns to the client, the format is xxx.xxx.xxx.xxx-
xxx.xxx.xxx.xxx 
CHAP Secrets: User name and password of the client using L2TP service 
Note: Please ensure client IPs do not overlap with modem DHCP server IP range. 
       The format of CHAP Secrets is user * password *.