Implement a virtual linux network device, like the vlan functionality, and a special way of network package filtering on this device. The implementation consists of a kernel part which asks a userland part if a new connection is acceptable or not. A connection is defined as a source ip:port to a service port on the server – this triples define who is allowed to talk to the services and who is not. The system should be implemented within the 2.6 kernel series. The implementation need to make use of caches and hashes of the dynamic ruleset in a way the filtering does not influence the normal network traffic.
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Hi! I had developed similar programm as part of firewall on LINUX 2.6 base. I am ready to do it for you. Cost and time of work maybe decrease after discussion of detailed specification. Best regards, Pug