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As I recently discovered, you cannot run a software firewall of any kind inside a solaris container. Everything else about SmartOS seems quite great to me, but my evaluation term was limited.

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Actually that is not the case. In SmartOS you have two options for networking. You can run a zone in "IP exclusive" mode which will give the zone full control over its networking stack. This means you can run a firewall or even change the IP addresses, etc from within the zone. SmartOS makes that apply to VMs as well. There are also anti-spoof mechanisms built into the OS to ensure that you dont get unfriendly neighbours.

Here is a rough overview: http://en.wikipedia.org/wiki/OpenSolaris_Network_Virtualizat...

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