ftp client hang

ftp client hang

[Eddie Shi]

Hi,
  I am using the 2.4.17 kernel with newnat patch. When I use ftp with
passive mode off, the ftp client would hang if client tries to get a file
which does not exist.

  Does anyone have similar problem? My router is masquerading 192.168.1.2 ->
63.206.100.200


  1. ftp oss.sgi.com
    login
    password:

  ftp> cd pub
  ftp> get junk	  ***junk does not exist in the directory***

     200 PORT command successful
     500 Can't open junk: No such file or directory

  ftp> ls

     *** this would hang the client****


    I then patched the latest ip_conntrack_ftp.c and ip_nat_ftp.c , the
resuld is the same.

    When "ls" is issued, the ftp server sees the following from ethereal
dump:
      Request: PORT 63,206,100,200,4,88
      .
       Response: 200 PORT command successful
       Request: RETR junk
       Response: 550 junk: NO such file or directory
      .
      Request: PORT 192,168,1,2,4,89         **** I think here is the
problem when "ls" command is issued ******
      Response: 502 Illegal PORT command

    The following entry in /proc/net/ip_conntrack

    EXPECTING: proto=6 src=128.167.58.27 dst=63.206.100.200 sport=0
dport=1112


   Please include me in the response since I am not in the mailing list.
   Thanks



 Eddie