Setting a static IP in OpenSolaris is similar to Linux, but yet again; differences arise…

vi /etc/resolve.conf (make sure dns is correct [nameserver 10.0.0.1]
vi /etc/nwam/llp [change 'gani0 dhcp' to 'gani0 static 10.0.0.100' where gani0 is your interface, and 10.0.0.100 is the ip address you would like to assign]
# restart network
vi /etc/defaultrouter (add your router '10.0.0.1')
svcadm enable svc:/network/physical:default
svcadm restart svc:/network/physical:nwam

This is a quickie but a goodie…

Resources:

http://briancline.org/read/file_server_3_tweaking_opensolaris