维护中发现国际漫入用户无法使用GPRS业务，经在SGSN上进行DNS解析，发现测试得到的地址有时正常，有时显示为空。通过LMT查看SGSN9810设备告警，发现测试主机地址为空时，SGSN上有大量“GTP—C隧道路径断”的告警，对端IP为“212．129．65．225”与“212．129．65．233”。而测试主机地址正常时却没有上述两个IP的告警。对比告警与国外漫游用户正常使用GPKS业务时所要完成的信令流程以及所涉及的IP地址和路由通达情况等，基本可以确定国内SGSN与国外运营商GGSN之间的Gn接口路由中断导致漫游用户和移动网络之间无法完成“PDP上下文激活”流程，造成国外漫游用户无法使用GPRS业务。经了解，国外运营商为优化数据流量，对部分国际漫出路由进行调整。%Maintaining found diffuse into the international business users can not use GPRS,the DNS resolution on the SGSN and found the address of the test to be normal sometimes,and sometimes appears to be empty.By LMT view SGSN9810 device alarm,found the test host address is empty, SGSN has a lot of＂GTP-C tunnel path breaking＂the alarm,the remote IP is＂212.129.65.225＂and＂212.129.65.23＂.The test,he was not the normal host address IP-two alarms.Contrast the normal alarms and foreign roaming users to use GPRS services when the signaling process to be completed and the respective IP address and routing accessible and so on,is almost certain domestic and foreign operators SGSN GGSN Gn interface between the routes leading to roaming users and disruption mobile networks can not be complcted＂PDP context activation＂process,resulting in foreign roaming users can not use GPRS service.The understanding of foreign operators to optimize the data flow, diffuse some way by the internationai adjustment.
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