| 摘要 |
A device, DEV, 20, such as a terminal device, comprising a memory 206 and a processor 208, the processor being adapted for executing an operating system, OS 204, whose instructions are stored in the memory, 206, through which OS an application, APP, can further be executed, the application permitting packet data to be provided to or from the device and a server. The OS 204 interacting with the APP using OS specific port numbers when exe- cuting the APP, the device is being operative to - receiving 101 information PA_NOT concerning a port mapping policy PPOL that specifies a plurality of applications, wherein for each application a predetermined assignable port space is defined within which an application specific port P_APP can be assigned; - starting 105 an application APP_S; - having an OS specific port P_OS assigned 107 to the started application APP_S; - assigning 109 an application specific port P_APP for the OS specific port P_OS in accordance with the port mapping policy PPOL; - translating 112, for traffic relating to the started application 110, internet packets P to be transmitted for the started application, such that for a OS specific source port P_OS, the OS specific source port field of packets to be transmitted is ex- changed with the assigned application specific port P_APP, - transmitting 114 the translated traffic with the assigned application specific source port. fig. 2 |
