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The security group rules will be applied when a NIC is attached to a virtual machine, and will only affect traffic to/from the network to which the NIC is attached. For example if a NIC connected to network net1 has a security group that allows ingress on port TCP/80, then when it is attached to a virtual machine, the firewall rules will be changed to allow traffic on port TCP/80 from net1 into the virtual machine. This must have no effect on the ingress/egress rules being applied to other NICs on the virtual machine.

When a NIC is detached from a virtual machine the security group rules for that NIC will be removed from the system. Again, this must not affect traffic on any other NIC attached to the virtual machine.

The legacy semantics of the deployVirtualMachine operation will be preserved; if there are security groups specified as part of a deployVirtualMachine command then they will be associated with each of the NICs that get created as a result of that command. For example consider a system with two security groups (sg1 and sg2) and networks (net1 and net2) and a command of the form

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