L2TP/ipsec firewall config: /ip firewall mangle chain=input action=mark-packet new-packet-mark=ipsec passthrough=yes protocol=udp dst-port=500,4500 log=no log-prefix="" /ip firewall filter 3 chain=input action=accept protocol=udp dst-port=1701 packet-mark=ipsec log=yes log-prefix="&qu...