How to add virtual interfaces to PPPoE

[toricmedia]

Hi..

I have my modem set up in bridge mode and eth0 set to PPPoE in Zentyal.

My question is how do I set up virtual interfaces on this interface, so that I can map my external static IP addresses?

When you select PPPoE the virtual interface option doesn't appear and although I can do it through the shell with "ifconfig eth0:0 www.xxx.yyy.zzz" it isn't persistent through a reboot or network reconfiguration.

Can anybody please point me in the right direction?

Thanks.