An openvpn client (windows 64 bit -presumable windows 8-) is connecting my OpenVPN server normally. After connecting, it is routing all it's vpn related traffic through the vpn, natting (seems to be doing that) it's IPv6 address via the IPv4.
The server shows in log:
Thu Dec 17 15:34:39 2015 us=611122 user@company/xxx.xx.xxx.xxx:50135 MULTI: bad source address from client [fe80::8868:xxx:xxx:xxx], packet dropped
All packets sent by the client are dropped like this, so VPN tunnel is established and kept alive but the client can't access any service
I don't have access to client terminal as it is in the other side of the world, nor I don't have too much experience in windows at all.
The client is generating the routing tables successfully, so is not permissions problem on it's side (is the only related information I found that could be causing the issue)
Windows client is OpenVPN 2.3.9 Server is Debian 8.2 with Openvpn 2.3.4-5
Seems that the server shows the natted IPv6 as a spoofed address. And I don't know what can I change in windows side to nat better that address, nor in the server side as I didn't get this problem before and I'm not getting any look on google nor serverfault.