Patent attributes
A method of providing a firewall to protect a set of virtual machines on a host node that is one of multiple host nodes that host virtual machines. The method stores a table of allowed connections for each virtual machine on the host node. Upon a particular virtual machine moving from the host node to another host node, the method deletes records of a first set of allowed connections that each identify the particular virtual machine and do not identify any other virtual machine in the set of virtual machines. Also upon the virtual machine moving, the method edits records of a second set of allowed connections, each identifying the particular machine and one other virtual machine in the set of virtual machines on the first host node, to remove an identifier of the particular virtual machine.
