11-20-2018
In global zone, a network interface (VNIC) is created on L2 (MAC layer), with unique MAC address.
That is created/assigned to a zone, during zone install/creation or can be done manually as you did in first example.
When using exclusive IP stack, global zone does nothing on IP layer (L3).
So you do not need or require those forwarding options on global zone, or anything really outside vnic definition for zone.
As for your original problem, i presume KVM virtual switch discards everything not coming from assigned interface MAC from options for solaris 11 guest.
For a lab enviroment you can probably a tcpdump or snoop on kvm hypervisor interface and global zone guest, then see if network works in non global zone when dumps are running.
Hope that helps
Regards
Peasant.
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