SoftEther VPN Server on OpenWrt: Couldn't Get IP address by DHCP on Client Side

[march_happy]

I am trying to create a L2TP VPN server follwing this guide (Though I installed SoftEther directly from OpenWrt official repo). By part 6a, I was expecting get IPv4 and IPv6 address assigned by interface br-lan's DHCP server. But then found out that I have to manually set IPv4 address on client side (Windows), otherwise I would get Error 720.

My OpenWrt /etc/config/network content is available at https://pastebin.com/mqjs8GkW. Interface br-lan's DHCP server is up and running as I can get address assigned by DHCP on other device connected physically to br-lan. The virtual tap interface's name is tap-tap and I think that I have correctly bridged it to br-lan.

And firewall settings:

Name	Zone -> Forwardings	Input	Output	Forward	Masquerading	MSS clamping
lan	lan -> lab_lan, njucm_lan, lab_lan	Accept	Accept	Accept
wan	wan -> REJECT	Reject	Accept	Reject	√	√
njucm_lan	njucm_lan -> REJECT	Accept	Accept	Reject	√
lab_lan	lab_lan -> ACCEPT	Accept	Accept	Accept

P.S. I tested from NJUCM_Lan, this should't be related to firewall because I could connect to server.

[randyrodriguez]

Hi. If you're still interested in fixing this, i suggest you use softether's vpnazure cloud vpn service. It can traverse NATs and Firewalls, including OpenWRT's. No need to configure anything in the firewall. I just successfully configured a remote access setup on my home router.

[ulmwind]

How have you derived, that you've BRIDGED tap-tap? On firewall configuration I see only forwarding rules.