SoftEther VPN Client Linux not injecting routes [5$ reward]

[RetroBat]

Hi all,

Setup

I have setup a SoftEther VPN Server with Local Bridge to simulate LAN connection for playing LAN games. Installed on WIndows 10 VM on a hypervisor. My Windows clients can connect without issues and broadcast IPv4 traffic is working fine. The windows users have configured with a GUI and the SoftEther VPN automatically configures routes. One of my users is using Linux and has successfully configured with CLI. The connection is working and his router does not serve local IPv6 addresses. However when vising Whats my IP sites check his IP and confirm if VPN connectivity he can confirm he has a IPv6 address in the range and from the ISP from the server network. So SoftEther injects IPv6 routes successfully.

Server local range: 192.168.178.x/24
Server IPv6: 2001:1c02**********
Bridge functionality is being used by Windows clients without any issues. They can join the LAN session in the 192.168.178.x/24 network where I am hosting. I'm not connected as a client.

Issue
IPv4 route changes are not being made by SoftEther VPN Client on Linux. IPv6 route changes are working successfully. We can use the IPv6 route table as a clue to help solve this issue.

Client information
OS: Fedora
IPv4 route table when not connected to VPN server

ipa.png

IPv4 and IPv6 route table when connected to VPN server

ipv6 (Small).png

Interfaces information(note that vpn_mynic is the virtual SoftEther tunnel interface

interfaces (Small).png

What we have tried so far
- Check if IP forwarding Linux has been enabled with: cat /proc/sys/net/ipv4/ip_forward
- let DHCP retrieve IP adres from tunnel NIC: sudo dhclient -r vpn_mynic
- some route commando's like: sudo ip route add default via 192.168.4.1 AND ip route add 192.168.178.1 via 192.168.4.1

Reward
I offer a reward for the effort of helping me solving this issue. I can sent 5$ via Paypal.