From: Tarun Pahuja (pahujat@gmail.com)
Date: Wed Aug 29 2007 - 16:07:51 ART
Mohammad,
I have a few questions for you.
1) what firewall are you using?
2) what ftp client are you using?
3) were you successful in downloading a 5MB file from the internal network
using the same ftp client and from the same server?
4) Are you blocking any ports on the firewall?
Does your ftp client support Active and Passive Mode? If yes, Try the
following link:
http://slacksite.com/other/ftp.html
Please let me know if this helps,
Tarun Pahuja
CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
On 8/29/07, Mohammad Saeed <mzsaeed@gmail.com> wrote:
>
> Actually we have successfully downloaded from same FTP Server to other
> routers and switches on Internal Network, but the problem is on
> devices in DMZ Zone...
>
>
> Thanks for your input.
>
> Regards,
>
> Mohammad Zahed Saeed
>
> On 8/28/07, eicc tester <reto_ccie@yahoo.com> wrote:
> > Sometimes FTP Server software are the problem, did you try with another
> FTP
> > Server softwares?
> > reto
> >
> > Mohammad Saeed <mzsaeed@gmail.com> wrote:
> > 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
> >
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