Route specific external IP to specific internal IP on a PPTP server

I have PPTP vpn server installed on my ubuntu and connected from my another pc to this server.

on my client I have some application connects to this IP address tcp:// and I would like to route this IP to another IP address.

What I have tried and partially working is:

iptables -t nat -A PREROUTING -d -p tcp -j DNAT --to  /sbin/iptables -A FORWARD -s -d -j ACCEPT  sysctl -w net.ipv4.conf.eth0.route_localnet=1 

When I run this command on my server and try to connect to that IP I get connection failed

telnet 8888

and when I delete it the connection works.

I have a TCP server on my server listening on 8888 and it works but I don’t know what I’ve missed.