The more I play with ispconfig 3 and the more I read, the more impressed I am with this software, its a nice open framework that allows you to do almost anything you wish, the data stored in a table format make it easy to develope from a programing pespective.
All the web sites have a "*" in ispconfig > sites >IP Address, I don't have the option to enter an IP.
I also had a look at my apache config files
In my /etc/apache2/sites-available/ mywebsite1.conf I have:-
## added for isp config
NameVirtualHost 192.168.100:80 192.168.0.100 is my wireless card
Reading the apache virtual hosts docs surgest that its configured to "names".
In ispconfig I have entered the ip 10.0.0.10 of my wired nic for all the A records (I have 2 network cards)
I've just setup another web site using the ip 192... and that won't work with webmail unless I add a link to squirrelmail.