From: Mohammad Saeed (mzsaeed@gmail.com)
Date: Wed Aug 29 2007 - 16:24:21 ART
Please check the answers to your questions after every question.
I have a few questions for you.
> 1) what firewall are you using?
Its a Nokia Firewall.
> 2) what ftp client are you using?
I am using normal FTP commands in Cisco IOS on the router
> 3) were you successful in downloading a 5MB file from the internal network
> using the same ftp client and from the same server?
Yes, same type of router in Internal Network successfully downloaded
the 5MB image from the same server
> 4) Are you blocking any ports on the firewall?
If that would be the case, I think that router in DMZ shall not be
able to download smaller (100KB file) from same server using same
method, only if FTP application can transfer smaller filer only on
CONTROL Connection which is opened on port 21, and this was my
question that does FTP Client has ability that if file size is small,
it receives that data on Control Channel? And no need for server to
initiate DATA Channel using port 20 as sourse port????
>
> Does your ftp client support Active and Passive Mode? If yes, Try the
> following link:
> http://slacksite.com/other/ftp.html
It does, but we are using only normal mode which shall be active mode
in whoch server initiates the DATA Channel to the client, using sore
port 20 and destination port RANDOM port number proposed by client.
>
> 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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