I now played around with iptables (the whole day) to make my rules work, but there is one issue.. all traffic that I redirect goes through my server and back through my server. We are talking about high HIGH amounth of bandwidth. So I hoped there was a option to redirect a user to the external global IP, so it talkes to the external IP and the users IP directly.
I now did:
iptables -t nat -A PREROUTING -p tcp --dport 25 -j DNAT --to-destination 188.8.131.52:25 iptables -t nat -A POSTROUTING -j MASQUERADE
*this is just a example, the real project is not port 25 and is also a other program (we work on...)
But now all traffic goes like this User>MyServer>ExternalServer>MyServer>User
but i hoped to get something like this: User>MyServer>ExternalServer>User
Simular to CNAME or maybe htacces redirect. Is something like this even possible?