Ubuntu: Fake ip address

I have a software package which is hard-coded to open a connection to a certain local IP address. Unfortunately, the local network settings have changed, And I can't access the source code (long story).

Is there a way - like ssh tunneling - to redirect a certain ip address to another?

For example, my software would contact 192.168.1.100, which will be redirected to 192.168.1.15, a real address on another machine, in a transparent way.