[LARTC] newbie question - how to downgrade ftp-data traffic

Linux Advanced Routing and Traffic Control

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On Fri, Jan 18, 2002 at 12:39:58AM -0800, Troy Rockwood wrote:
>    I'm new to the list and to traffic shaping, however I understand the
> idea behind it I believe.  My home computer is connected via DSL.  I
> run an ftp server and I have a home network behind the machine so that
> it acts as the router/gateway for that network.
>    I get a lot of ftp traffic, sometimes so much that traffic from the
> home network is too slow to be useful.  What is the easiest way to give
> all other traffic priority over ftp-data traffic so that it doesn't eat
> up all my bandwidth and starve my wife's web browsing?  Here is what I
> have tried:
> 
> I have tried to use iptables to change the TOS bits such that traffic
> other than that to port 20 is given priority:
> 
> [some commands deleted] 
> This does not seem to move ftp-data packets into the lowest priority
> bin.  I'm not sure what syntax to use to move all BUT ftp-data packets
> to the high priority bin or how to move only ftp-data packets into the
> lower priority bin.
> 
> This is probably something stupid and easy but it's not clear to me
> right now.  Any help would be greatly appreciated.  What I'm looking
> for is the simplest way to give other traffic higher priority than the
> traffic to/from the ftp-data port (20).  Thanks in advance and thanks
> for your patience.
> 

Depending on the ftp mode clients use, data-port may not be the port 20.
In passive mode, the client choose himself the data port.
Maybe it is your case.

> =====
> Troy Rockwood - troyrock@rocketmail.com
> 

--
Michael Strauss



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