| 摘要 |
<p>A file transferring method of Network Address Translation (NAT) traversal includes: User Equipment (UE) in external network sends Transfer Control Protocol (TCP) link connection request to Application Server (AS) in local network, after address and ports are converted by NAT; AS responds the request, and transmits response message comprising the address and ports of UE converted by NAT; UE receives the response message, establishes TCP link with AS and holds TCP link through NAT by using the address and ports converted by NAT;UE carries out file transferring by the above holding TCP link between UE and AS. AS responds and permits that UE uses the address and ports converted by NAT and establishes TCP link with AS, so that NAT can be traversed to realize file transferring between UE in external network and AS in local network. Use efficiency of network is improved, and the cost of network building is reduced.</p> |
