 | | | Problem reaching ftp server on my LAN through the internet | Problem reaching ftp server on my LAN through the internet 2004-01-29 - By jazzip jazzip
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Hi. Thanks for answering back so soon Ben. I 'm setting up the server for friends and me to share files and I
have the feeling that what you wrote on your last reply might be the answer to the problem. Thanks a lot!
-- -- Original Message -- --
From: "Ben Yau " <byau@(protected) >
Date: Wed, 28 Jan 2004 10:41:04 -0800
To: "redhat list " <redhat-list@(protected) >
Subject: RE: Problem reaching ftp server on my LAN through the internet
>
> >
> > > >
> > > > Hi.
> > > > I 'm a linux newbie and I 'm trying to set up an ftp server on a
> > > > LAN. The server is up and running on redhat 9.0.
> > > > The server is conected to a LAN with other Linux and windows
> > > > computers through a wireless gateway attached to a cable modem.
> > > > I have a static IP asigned by my ISP so I can access the gateway
> > > > (and therefore the ftp server) from anywhere over the internet.
> > > >
> > > > The problem is that when I log into the server from any box
> > > > within the LAN using the external IP address (going outside the
> > > > LAN to the internet and then coming inside again) I get this error:
> > > >
> > > > ftp > ls
> > > > 500 Unknown command.
> > > > 227 Entering Passive Mode (192,168,1,19,229,168)
> > > > 500 Illegal PORT command.
> > > > ftp: bind: Address already in use
> > > >
> > > > But if I log into it using the internal IP address or from
> > > > anywhere outside the LAN using the external IP address (over the
> > > > internet) the ftp server works just fine. I thought that maybe
> > > > either the server or the gateway where blocking the access with a
> > > > firewall but if that where the case, I wouldn 't be able to even
> > > > log into the server right?
> > > > I hope I was clear, english isn 't my first languaje but please do
> > > > write if you have any idea. Any help is greatly apreciated
> > > >
> > >
> > > Even though this flag is said to have no effect anymore, try
> > starting the
> > > ftp sessoin anyway with the -p flag on and see if it works
> > > ftp -p
> > > It 's meant to start the ftp session as passive right off the bat.
> > >
> >
> > Thanks Ben.
> > I tried it out but it didn 't work.
> > Thanks anyway
> >
> >
>
> Is this an academic exercise by the way? YOu are just wondering why it does
> that? Since internal clients should access your ftp site internally as a
> good rule of thumb.
>
> Anyway, I have a feeling it 's just something that happens with the firewall
> since you are natting out and then coming back in again. The ftp server
> responds back to client telling client to use port XXX. This response goes
> back out the firewall and in again to the client. The client then attempts
> to open on that port back out through the firewal but it 's already in use on
> the firewall by the server so you get that "Address already in use " error.
> So it supposed to happen that way.
>
> My best guess.
>
> Ben
>
>
>
>
>
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