1. To do a quick test where the configuration won’t have to survive a reboot
2. On an interface in a global zone
3. On an interface in a non-global zone

These are the solutions we used:

1

$ ifconfig abrX:Y plumb

while “abrX” is the abbreviation for an installed interface.
Now you can use the new interface abrX:Y as you want.

2
We needed it to have an an external(Internet) and an internal address. So we made an entry in /etc/hosts for the primary address in the old fashioned way(we do not yet use NWAM):

10.5.250.100    fire

while we put the other addresses in /etc/hostname.abrX:

fire
addif 141.72.100.100/24

where /24 implies: netmask ffffff00 broadcast 141.72.100.255

3
We wanted the interfaces to be visible from the global zone via a local address while being available from the Internet. Therefore we defined a local address as in 2 via /etc/hosts and /etc/hostname.abrX, but we also included the Internet address in the zone configuration:

$ zonecfg -z zone1
zonecfg:zone1> select net physical=abrX
zonecfg:zone1:net> set address= 141.72.100.101/24
zonecfg:zone1:net> end
zonecfg:zone1> commit
zonecfg:zone1> exit

We will now take a look at IP instances, because using them we can achieve to only have the non-global zones visible in the Internet, while the global zone is only vulnerable in the local subnet.