Under R3640E, users fail to download Word documents after L2TP dialing, and they can download file of other format normally. When they download Word documents, sometimes they cannot perform the operation absolutely, and sometimes very slowly, being interrupted after downloading 90%. The problem persists although the extension name of Word document is changed, but it is solved after compressing Word documents.
Topology: OA Server--O/E convertor of R company--R3640E(LNS)-----C 4XX7----MA5200(LAC)-----PC
1. Change the MTU of R3640E/C 4XX7/MA5200的MTU to 1500 as default, and reduce MSS to 1024. The problem persists.
2. Reduce the MTU of OA server at source file side, but the problem persists also.
3. Check the intermediate lines. There is one 3XX O/Econvertor of R company between OA server and R3640E. Replace the O/E convertor with the counterpart of other vendor's, and the problem is solved.
O/E convertor is responsible for abnormal download of word document.