| During the technological revolution, computer network has gradually transit from AppleTalk, IPX and NetBIOS to IP stage. However, the current network system lost some characteristic. For example, it is hard to add device with no configure or incomplete configure. Every devices needs unique IP address, and all depend on DHCP. Dynamic IP address distribution makes the IP changed easily, and the device has to set static IP by administration, or they couldn’t be connected. When the scale of devices spread, workload will increase, makes it become harder. So here comes a requirement that one can explore all the available services and connect them automatic, without knowing their host names or their IP. For this wishes, Bonjour was born based on mDNS Service Discovery. The device that has installed Bonjour is enable to advertise its service by itself, or search other service.Standard Bonjour application of Apple does not limited the query of client and the advertisement of server, it is lack of management of equipment, it had also not implement the service discovery between different VLAN, and too many transmit of mDNS packet could made high load to wlan network. To achieve the need of enterprise-level users that optimize and manage the Bonjour, it’s necessary to develop a Bonjour system software based on access controller, so as to implement the requirement of low rate of flow, manageable, and high efficiency.The mdns query packet resolve module and agency response module are designed, implemented and tested in this project. Follow the resolution of every segment in the mdns packet head and recover of domain name in the data zone of packet, to get the information of client, then store them to use when response and management. When there are resources in the cache of AC which can be used to response, the gateway system will pack them in agency packet, and response it to client. |
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