From: Mohammad Saeed (mzsaeed@gmail.com)
Date: Mon Aug 27 2007 - 15:55:29 ART
Hello,
I am facing problem downloading IOS Image of almost 5MB size to the
router from FTP Server. The session gets stuck and never recovers. But
if I download some small file like 100KB from same FTP Server to the
same router's FLASH it works.
When I look TCP Dump for successful attempt of downloading smaller
file, I don't see FTP DATA Connection opening up from FTP Server using
source port 20 to the random port sent by FTP client on the router to
the server telling the server to initiate the DATA connection to
transfer the data. But there is communication happening from FTP
Client (Router) using a random source port number to the FTP Server's
port number 21 which is normally used for FTP Control connection. And
file transfer does happen successfully.
Now my question is that Can FTP Transfer DATA using the CONTROL
Connection which CLIENT will open with the server on port 21 without
opening up DATA Connection which is in normal FTP Mode will be opened
up from server using source port number 20 to the random port number
of the client, that client would tell the server to open DATA
connection on?
Any help is highly appreciated :)
Regards,
Mohammad Zahed Saeed
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:13 ART