/etc/l2tpd/l2tp-secrets
/etc/l2tpd/l2tpd.conf
/etc/rc.d/init.d/l2tpd
/etc/ppp/options.l2tpd
/etc/ipsec.d/L2TPD-PSK.conf
/etc/ipsec.d/L2TPD-CERT.conf