FTP Client Uses Only One IP Address on Multihomed Workstations

ID: Q149528

The information in this article applies to:

Microsoft Windows NT Workstation version 3.51
Microsoft Windows NT Server version 3.51

SYMPTOMS

The Microsoft FTP client does not take advantage of multihomed workstations. By default, the FTP client binds to the first IP address that can reach the remote station for its control connection and uses that local IP address for any subsequent PORT commands.

NOTE: For more information on FTP control connections, PORT commands, etc. please refer to Internet RFC 959.

WORKAROUND

To resolve this problem, install the fix mentioned below.

A new switch has been added to FTP to allow the use of multiple network interfaces for data connections.The new switch is:

-a

Use IN_IPADDR when binding.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Windows NT Workstation version 3.51 and Microsoft Windows NT Server version 3.51. This problem was corrected in the latest U.S. Service Pack for Windows NT Workstation or Server version 3.51. For information on obtaining this update, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: 3.51 prodnt

Keywords : nttcp NTSrvWkst
Version : 3.51
Platform : WINDOWS
Issue type :