HAproxy can be used not only for complex load-balancing scenarios, but also for simple port forwarding. Useful for forwarding packets originating from both local and external hosts.
listen postgresql 0.0.0.0:5432
mode tcp
stats enable
balance roundrobin
server postgresql-db 192.168.0.1:5432 check
mode tcp
stats enable
balance roundrobin
server postgresql-db 192.168.0.1:5432 check