Openvpn/Dockerfile:

FROM camel:5000/ventz

RUN echo "nameserver 8.8.8.8"  > /etc/resolv.conf && \
    echo "nameserver 8.8.8.8" >> /etc/resolv.conf && \
    apk update && \
    apk add vim mtr

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Routes from my linux box hosting the containers:

 ╰>  $ ip route
default via 172.20.0.1 dev ens160 proto dhcp src 172.20.10.28 metric 100
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
172.20.0.0/16 dev ens160 proto kernel scope link src 172.20.10.28
172.20.0.1 dev ens160 proto dhcp scope link src 172.20.10.28 metric 100
192.168.208.0/20 dev br-00c9f3d1b3da proto kernel scope link src 192.168.208.1
192.168.224.0/20 dev br-79cc56fd60c3 proto kernel scope link src 192.168.224.1
192.168.240.0/20 dev br-14197bbd53ab proto kernel scope link src 192.168.240.1

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IP Addresses within the container:

bash-5.0# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
    link/none
    inet 10.2.0.67/24 brd 10.2.0.255 scope global tun0
       valid_lft forever preferred_lft forever
568: eth0@if569: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:c0:a8:e0:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.224.2/20 brd 192.168.239.255 scope global eth0
       valid_lft forever preferred_lft forever
570: eth1@if571: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:c0:a8:d0:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.208.2/20 brd 192.168.223.255 scope global eth1
       valid_lft forever preferred_lft forever

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Routes from my openvpn container:

bash-5.0# ip route
0.0.0.0/1 via 10.2.0.1 dev tun0
default via 192.168.224.1 dev eth0
10.2.0.0/24 dev tun0 proto kernel scope link src 10.2.0.67
128.0.0.0/1 via 10.2.0.1 dev tun0
192.168.1.0/24 via 192.168.224.1 dev eth0
192.168.208.0/20 dev eth1 proto kernel scope link src 192.168.208.2
192.168.224.0/20 dev eth0 proto kernel scope link src 192.168.224.2
209.99.94.35 via 192.168.224.1 dev eth0