I'm trying to configure L2TP passthrough for my VPN what is on my LAN (Synology NAS).
Modem <-> LEDE router <-> NAS/VPN
I 've configured ports forwarding (UDP 1701, 500, 4500) and opened these ports (Traffic rules) via LuCI, but i cannot establish connections from outside my network to connect to my VPN...
I've checked the wiki (firewall settings) , but i'm not confortable with this mostly advanced documentation. However i think my config is correct.
Can you help me?
The "IPSec passthroug" section at the end of that page (https://lede-project.org/docs/user-guide/firewall_configuration#ipsec_passthrough) seems pretty straightforward.
Thank you for you're answer. However my /etc/config/firewall already have these rules...
Well, what do the logs say?
Howdy,
alexisju, your problem solved? If not I'll try to help you! 
I have the same problem on LEDE Reboot 17.01.4
Sagem F@ST2704N
can anybody help?
VPN PPTP not connecting through dsl.
same problem, with same server vpn and l2tp, from within LAN everything OK. But I can not route the traffic to WAN. Any solution at the end?