<Huawei> sys
[Huawei]int g0/0/0
[Huawei-GigabitEthernet0/0/0]ip add 12.12.12.1 255.255.255.0
[Huawei-GigabitEthernet0/0/0]quit
[Huawei]ip route-static 0.0.0.0 0 12.12.12.2
[Huawei]aaa
[Huawei-aaa]local-user 20wl password cipher 20wl
[Huawei-aaa]local-user 20wl service-type ppp
[Huawei-aaa]quit
[Huawei]ip pool 1
[Huawei-ip-pool-1]network 10.1.1.0 mask 24
[Huawei-ip-pool-1]gateway-list 10.1.1.1
[Huawei-ip-pool-1]quit
[Huawei]interface virtual-template 1
[Huawei-Virtual-Template1]ip address 10.1.1.1 24
[Huawei-Virtual-Template1]ppp authentication-mode chap
[Huawei-Virtual-Template1]remote address pool 1
[Huawei-Virtual-Template1]quit
[Huawei]l2tp enable
[Huawei]l2tp-group 1
[Huawei-l2tp1]undo tunnel authentication
[Huawei-l2tp1]allow l2tp virtual-template 1