set vpn ipsec interface 'eth0'
commit

set vpn l2tp remote-access authentication local-users username alice password 'notsecure'
set vpn l2tp remote-access authentication mode 'local'
set vpn l2tp remote-access client-ip-pool test range '10.1.1.0/24'
set vpn l2tp remote-access gateway-address '10.1.1.1'
set vpn l2tp remote-access ipsec-settings authentication mode 'pre-shared-secret'
set vpn l2tp remote-access ipsec-settings authentication pre-shared-secret 'not-so-secret'
set vpn l2tp remote-access outside-address '192.168.1.1'

vyos@vyos:~$   sudo swanctl -L
vyos@vyos:~$

delete vpn l2tp
commit

vyos@vyos:~$ sudo swanctl -L
l2tp_remote_access: IKEv1/2, no reauthentication, rekeying every 3600s, dpd delay 15s
  local:  10.17.1.223
  remote: %any
  local pre-shared key authentication:
  remote pre-shared key authentication:
  l2tp_remote_access_esp: TRANSPORT, rekeying every 3272s, dpd action is none
    local:  dynamic[0/l2f]
    remote: dynamic