Do you need an answer to your question or an answer from falko
Open the file /home/admispconfig/ispconfig/lib/config.inc.php and cahnge the line:
$go_info["server"]["network_config"] = 1;
$go_info["server"]["network_config"] = 0;
Then restart your server and login to the ISPConfig controlpanel to change the IP's in the IPList.
General remark: Please make a new thread in the Forum if your question is not related to the topic of the thread.