Solaris 11 Express
NWAM (Network Automagic) allows to draw IP addresses dynamically through different and manage them through a nice GUI.
It's however not needed to a system with a static, manually configured network configuration.
The following command sequence will allow to move back to the old Solaris 10 world if needed:
# svcadm disable svc:/network/physical:nwam
# svcadm enable svc:/network/physical:default
Solaris 11 11/11
The nwam service has been retired. It's still there. Use:
# netadm enable -p ncp defaultfixed