Abstract:
A method of restricting transmission of data packets from a host entity in a network, comprising: transmitting outgoing packets to destination hosts whose identities are contained in a record stored in a working set of host identity records; over the course of repeated predetermined time intervals, restricting, to a predetermined number, destination hosts not identified in the working set and to which packets may be transmitted; deleting packets whose transmission has been restricted.
Abstract:
A method of restricting transmission of data packets from a host entity in a network, comprising: transmitting outgoing packets to destination hosts whose identities are contained in a record stored in a working set of host identity records; over the course of repeated predetermined time intervals, restricting, to a predetermined number, destination hosts not identified in the working to which packets may be transmitted; upon transmission of a packet to a host whose identity is not contained in a record in the working set, adding a record containing the host's identity to the working set and attributing a time to live to the record; deleting each record from the working set whose time to live has expired.
Abstract:
A process 23 runs directly on a host operating system 22, until the process 23 attempts an operation which can affect security of the host operating system 22 (such as loading a kernel module or using system privileges). A guest operating system 25 is then provided running as a virtual machine session within a compartment 24 of the host operating system 22 and running of the process 23 continues using the guest operating system. Operations of the process 23 which can affect security of the host operating system 22 are instead performed on the guest operating system 25, giving greater security. The guest operating system 25 is only invoked selectively, leading to greater overall efficiency.