| It is an inevitable result that IPv6 replaces IPv4. Now all seismological observation network systems are developed based on IPv4 protocol. Because IPv4 address is presented exhaustedly, each station can't have a fixed IPv4 address, and lead to that can't access the station data directly from the station level, and can only access data from the network center. In addition, now seismological observation network system is verifying the user by way of"user name and password", and doesn't encipher user name and password when transmitting. It's unsafe. If one illegal user intercepts user name and password, he can directly access all needing data. By way of developing seismological observation safety network system based on IPv6 protocol, we have developed new seismological observation system networking protocol under the IPv6 environment, and have accomplished the target of station level data sharing; the integrity and confidentiality of data have been guaranteed by each type enciphering methods for real time data; new certificate management and authentication mechanism have been set up; on the basis of experiment, developed out transitional technology from IPv4 to IPv6 based on the tunnel technology, confirmed the technical solution of IPv4 system transiting to IPv6 system, determined the access method and technical specification of the now observing station; by way of carrying out system reform trial to EDAS-24IP data acquisition device based on Linux embedded system and IPv4 protocol, making it support technique standard and specification of IPv6 earthquake sensor network now. These research resources give a very good basis for more application of IPv6 technology in the seismological observation technology industry in the future.When generating the station authentication certificate, we have put forward a new parameter management model in order more conveniently to gain the station authentication registering information. There are problems in the original parameter model: 1) XML pattern is used to the parameter file, so needing increase XML parsing class library. This will occupy the storage space of the embedded system; 2) only one parameter file exists in the embedded system, if this parameter file is lost, the system can not normally restart; 3) because of managing parameters with the share memory, increase the coupling among the application programs, and communication is inconvenient. By way of setting up new parameter management model, we solved these three problems of original parameter model: 1) Because of using new parameter file format, don't need to add parsing class library for XML, the storage space of embedded system is saved; 2) Use many back-up files for a parameter type, the phenomenon that system can't restart owing to the parameter file lost doesn't exist any more; 3) All communications are formed by way of the asynchronous signal of the Linux Kernel, and have reduced coupling relation between the application programs. |
