I'm afraid I don't understand that issue. For which parameter in the
wp-config.php file are you are you modifying the IP address? To which value? Can you tell us your domain to check it? Did you modify anything in the
/opt/bitnami/apps/wordpress/conf directory of the old server? If so, reproduce the changes in the new server and restart all services.
I also restored my working Wordpress Mutlisite from an image but when I try load in browser every site redirects to an IP address?
Can you give us more information about this as well? Also, can you run the bnsupport tool on your new server?
Apart from that, did you ask for help in the WordPress forums? If there is anything we are missing, they will be of help on this.