Docker - connect to VPN

I have Windows OpenVPN server running at 10.8.0.1.

server.ovpn is:

server 10.8.0.0 255.255.255.0port 1194topology subnetproto udp4       dev tunca "C:\\Program Files\\OpenVPN\\config\\ca.crt"cert "C:\\Program Files\\OpenVPN\\config\\server.crt"key "C:\\Program Files\\OpenVPN\\config\\server.key"dh "C:\\Program Files\\OpenVPN\\config\\dh2048.pem"#for debug, allow same certs on all clientsduplicate-cnkeepalive 10 120cipher AES-256-GCMcomp-lzopersist-keypersist-tunverb 3explicit-exit-notify 1

I start WSL and inside WSL2 (Ubuntu) I run docker image via:

docker run --gpus all --privileged -p 1777:1777 -p 1778:1778 --ipc=host --ulimit memlock=-1 --ulimit stack=67108864 -it --rm -v/mnt/d/data:/mnt nvcr.io/nvidia/pytorch:23.06-py3

Inside docker, I install network tools and OpenVPN via:

apt updateapt -y install net-toolsapt -y install netcatapt -y install iputils-pingapt -y install iproute2apt -y install iptablesapt -y install tracerouteapt -y install OpenVPN 

Now I mount to /mnt to and run

openvpn --config client.ovpn

client.ovpn is:

clientdev tunproto udp4remote a.b.c.d 1194resolv-retry infinitenobindpersist-keypersist-tunca ca.crtcert Client1.crtkey Client1.key    remote-cert-tls servercipher AES-256-GCMcomp-lzoverb 3

(certificates are in the same directory as client.ovpn)

I think that connection is established since if I do ifconfig, I can see:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500        inet 172.15.1.1  netmask 255.255.255.0  broadcast 172.15.1.255        ether 02:42:ac:0f:01:01  txqueuelen 0  (Ethernet)        RX packets 22289  bytes 30846027 (30.8 MB)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 10953  bytes 734146 (734.1 KB)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536        inet 127.0.0.1  netmask 255.0.0.0        loop  txqueuelen 1000  (Local Loopback)        RX packets 0  bytes 0 (0.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 0  bytes 0 (0.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500        inet 10.8.0.2  netmask 255.255.255.0  destination 10.8.0.2        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)        RX packets 0  bytes 0 (0.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 0  bytes 0 (0.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

However, when I do ping 10.8.0.1 (I have also tried ping -I tun0 10.8.0.1) from within the docker, I cannot ping the server or any other connected client.Docker over eth0 can ping internet servers without any problem.

What am I missing? Note: I am no expert in networking or VPNs