Restricting/Increasing the no of FTP connections to the Linux box

Restricting/Increasing the no of FTP connections to the Linux box

[Sarika Inamdar]

Hi All,

We have a PC which runs Linux 7.3. We have our application running which
collects data from routers and the router FTPs the data to the PC. The
data collected is large.

When we try to collect data for more than 2 devices, the PC hangs .. In
the sense, when we manually do an FTP to the Linux PC, the login prompt
does not appear. Same is the case with telnet prompt. But it does give a
message telling that the its connected to PC.

So, we would like to know, if we can increase the FTP connections on the
Linux box ? If yes, which file needs to be modified ?

Thanks in Advance,
Sarika

Re: Restricting/Increasing the no of FTP connections to the Linux box

[Jamie Harris]

So long as your box has sufficient resources it should support a pretty
large number of connections "out of the box", so you shouldn't need to
change anything, certainly I wouldn't expect you to have any problems with
just a few connections.

When you say you can ftp/telnet to the box and you don't get a prompt -
how long have you waited?  Do you eventually get in?  Also, is that
anything in your system logs? (/var/log/?)

cheers

Jamie...

> Hi All,
>
> We have a PC which runs Linux 7.3. We have our application running which
> collects data from routers and the router FTPs the data to the PC. The
> data collected is large.
>
> When we try to collect data for more than 2 devices, the PC hangs .. In
> the sense, when we manually do an FTP to the Linux PC, the login prompt
> does not appear. Same is the case with telnet prompt. But it does give a
> message telling that the its connected to PC.
>
> So, we would like to know, if we can increase the FTP connections on the
> Linux box ? If yes, which file needs to be modified ?
>
> Thanks in Advance,
> Sarika
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>


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RE: Restricting/Increasing the no of FTP connections to the Linux box

[Sarika Inamdar]

We have waited for almost 15 minutes for the prompt. It does not show up
:-(
Am not sure if there are any logs for the same.

-Sarika

> -----Original Message-----
> From: Jamie Harris [mailto:jamie@jharris.homeip.net] 
> Sent: Friday, May 30, 2003 1:41 PM
> To: sinamdar@cisco.com
> Cc: linux-admin@vger.kernel.org
> Subject: Re: Restricting/Increasing the no of FTP connections 
> to the Linux box
> 
> 
> So long as your box has sufficient resources it should 
> support a pretty large number of connections "out of the 
> box", so you shouldn't need to change anything, certainly I 
> wouldn't expect you to have any problems with just a few connections.
> 
> When you say you can ftp/telnet to the box and you don't get 
> a prompt - how long have you waited?  Do you eventually get 
> in?  Also, is that anything in your system logs? (/var/log/?)
> 
> cheers
> 
> Jamie...
> 
> > Hi All,
> >
> > We have a PC which runs Linux 7.3. We have our application running 
> > which collects data from routers and the router FTPs the 
> data to the 
> > PC. The data collected is large.
> >
> > When we try to collect data for more than 2 devices, the PC 
> hangs .. 
> > In the sense, when we manually do an FTP to the Linux PC, the login 
> > prompt does not appear. Same is the case with telnet prompt. But it 
> > does give a message telling that the its connected to PC.
> >
> > So, we would like to know, if we can increase the FTP 
> connections on 
> > the Linux box ? If yes, which file needs to be modified ?
> >
> > Thanks in Advance,
> > Sarika
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe 
> linux-admin" 
> > in the body of a message to majordomo@vger.kernel.org More 
> majordomo 
> > info at  http://vger.kernel.org/majordomo-info.html
> >
> 
> 
> -- 
> **  This message was transmitted on 100% recycled electrons **
> 
> 

RE: Restricting/Increasing the no of FTP connections to the Linux box

[Jamie Harris]

> We have waited for almost 15 minutes for the prompt. It does not show up
> :-(

Doesn't sound like it waiting for something external then as it would have
timed out by then.

> Am not sure if there are any logs for the same.

This would be where I would be looking next.  Just to clarify, it works
fine with just two connections, but any more and it goes pear-shaped
yeah??

Jamie...

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RE: Restricting/Increasing the no of FTP connections to the Linux box

[Sarika Inamdar]

Yeah that's right !!

We are also collected huge data across this connection . Will that be a
problem for this FTP connection failing.

Also which logs should I be looking at /var/ ?

Thanks,
Sarika

> -----Original Message-----
> From: Jamie Harris [mailto:jamie@jharris.homeip.net] 
> Sent: Friday, May 30, 2003 1:58 PM
> To: sinamdar@cisco.com
> Cc: linux-admin@vger.kernel.org
> Subject: RE: Restricting/Increasing the no of FTP connections 
> to the Linux box
> 
> 
> > We have waited for almost 15 minutes for the prompt. It 
> does not show 
> > up :-(
> 
> Doesn't sound like it waiting for something external then as 
> it would have timed out by then.
> 
> > Am not sure if there are any logs for the same.
> 
> This would be where I would be looking next.  Just to 
> clarify, it works fine with just two connections, but any 
> more and it goes pear-shaped yeah??
> 
> Jamie...
> 
> -- 
> **  This message was transmitted on 100% recycled electrons **
> 
> 

RE: Restricting/Increasing the no of FTP connections to the Linux box

[Jamie Harris]

> We are also collected huge data across this connection . Will that be a
> problem for this FTP connection failing.

It shouldn't make any difference, unless you have a really quick
connection that is somehow swamping the machine with only two sessions
open.

> Also which logs should I be looking at /var/ ?

I take it that you are running Redhat Linux, in which case I think you
want to look at /var/log/message but any of the files in /var/log really.

cheers

Jamie...

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RE: Restricting/Increasing the no of FTP connections to the Linux box

[Artem Daniliants]

 What FTP server do you use? I recommend switching to vsftpd, coz it's
probably most powerfull ftp server out there. Redhat/SuSe and others use
only vsftpd. Give it a try anbd see if it works better with vsftpd



On Fri, 30 May 2003, Jamie Harris wrote:

> > We are also collected huge data across this connection . Will that be a
> > problem for this FTP connection failing.
>
> It shouldn't make any difference, unless you have a really quick
> connection that is somehow swamping the machine with only two sessions
> open.
>
> > Also which logs should I be looking at /var/ ?
>
> I take it that you are running Redhat Linux, in which case I think you
> want to look at /var/log/message but any of the files in /var/log really.
>
> cheers
>
> Jamie...
>
> --
> **  This message was transmitted on 100% recycled electrons **
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: Restricting/Increasing the no of FTP connections to the Linux box

[Stephen Samuel]

It could be a problem depending on which FTP server you're using.
I'm wondeing if you have some sort of limit already set on your FTP server.
The usual result for that, however, would be that you should simply get
a message saying that you have too many connections.

If a running FTP transfer finishes does one of the blocked
connections suddenly start working?

Do you have a NAT filter or a firewall between your server and your
routers? It really does look like it's something other than the FTP
server program  having problems  (firewalls, etc).

the obvious place to look for error messages would be /var/log/messages .
look in /var/log, for other interesting logifiles, though. you may have
a /var/log/ftplog (or something like that) if you have an FTP server that
writes it's own logfiles instead of using syslog.

also: try doing a last...

   last | less

to see if the FTP connections are getting logged as logins.

Sarika Inamdar wrote:
> Yeah that's right !!
> 
> We are also collected huge data across this connection . Will that be a
> problem for this FTP connection failing.
> 
> Also which logs should I be looking at /var/ ?

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
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