is this problem fixed ? i was dealing with the same problem last week. you have to enter a new entry on both side for MASQUERADE.

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eno33557248 -j MASQUERADE

i used custom firewall app within the Marketplace, to be able to easily add rules to my iptables



Also, you have to make sure that both side have packet forwarding enabled. You can check with this command: cat /proc/sys/net/ipv4/ip_forward It will return 0 or 1.
If it's currently 0, you have to add these line in /etc/sysctl.conf and reboot:

# Packet forwarding
net.ipv4.ip_forward = 1
net.inet.ip.fastforwarding = 1