使用管理员账号登陆路由：

#进入配置模式
configure

#配置PPTP的账号验证模式,这里采用本地账号认证
set vpn pptp remote-access authentication mode local

#配置PPTP的DHCP的IP池与DNS
set vpn pptp remote-access client-ip-pool start 192.168.0.220
set vpn pptp remote-access client-ip-pool stop 192.168.0.240
set vpn pptp remote-access dns-servers server-1 192.168.0.1

# 配置监听地址,就是外网地址.
set vpn pptp remote-access outside-address x.x.x.x
#如果是拨号上网,IP并不固定,因此要将监听地址改为网关地址.
set service dns forwarding options "listen-address=192.168.0.1"


#添加一个账号test，密码123456
set vpn pptp remote-access authentication local-users username test password 123456

# 配置Firewall,如果默认开启防火墙，则在WAN_LOCAL中添加rule允许PPTP(TCP 1723)和 GRE(协议 47)通过.