Problem with forwarding mail.ru services through the cloud?

Question

linux

https://2ip.ua/ru/services/information-service/pro... - I determined mail.ru address blocks through this service . Wrapped all subnets on Mikrotik via VPN on a VPS in Amsterdam. VPS on Linux Ubuntu. Made FORWARD VPN subnets to 0.0.0.0/24. But ICQ doesn't work

Answer 1

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

Answer 2

It also helped me to add on the server openvpn
echo 1 > /proc/sys/net/ipv4/conf/tap1/proxy_arp
tap1 depending on the dev name
+ here is an interesting instruction