You can change the database manually for now and it will be forward compatibile.
To see the actual value, you can browse the "pluto_main" database with either the console tool mysql or a graphical tool like TOra under Linux and newbielink:http://www.webyog.com/ [nonactive] on Windows. Run this SQL statement to see the current value: SELECT IK_DeviceData FROM Device_DeviceData WHERE FK_DeviceData=32;. You should get only one row that looks like this: eth0,10.0.0.89,255.255.255.0,10.0.0.1,10.0.0.150|eth0:0,192.168.80.1,255.255.255.0.
What you have to do is update that value by replacing "eth0:0" with "eth1".
This whole procedure is on my TODO list (combined with PPPoE), but I didn't get to it yet and I can't make any promises (sorry).