it is quite complicated if you are not a Linux system admin. ddwrt is Linux OS for some routers,
-eeryv(eeryu);
2018-4-2{239}(#11456931@0)
openvpn over ssh tunnel will encrypt all openVPN traffic and pass it through SSH tunnel. Greatwall firewall for sure will not block ssh traffic, so it can not block openvpn over SSH. If you need more info, google "openvpn over ssh tunnel".
ok,thank you
-vega_lee(天津包子-就不改);
2018-4-2(#11457257@0)