EdgeRouter Lite/X L2TP VPN with RADIUS Authentication

set vpn ipsec ipsec-interfaces interface eth0
set vpn l2tp remote-access ipsec-settings authentication mode pre-shared-secret
set vpn l2tp remote-access ipsec-settings authentication pre-shared-secret <$PRE_SHARED_SECRET>
set vpn l2tp remote-access client-ip-pool start <$START_ADDRESS>
set vpn l2tp remote-access client-ip-pool stop <$END_ADDRESS>
set vpn l2tp remote-access dns-servers server-1 <$DNS1>
set vpn l2tp remote-access dns-servers server-2 <$DNS2>
set vpn l2tp remote-access outside-address <$WAN_ADDRESS>
set vpn l2tp remote-access authentication mode radius
set vpn l2tp remote-access authentication radius-server <$RADIUS_IP> key <$RADIUS_KEY>