Re: outbound shaping

[Andy Furniss <andy.furniss@xxxxxxxxxxxxx>]

> > > I am running proftpd on (192.168.1.101) with the port set to 65437 and
> > > with passive ports set to 50000-51000.  Proftpd allows you to specify a
> > > range of ports to use on passive transfers.  I need to be able to limit
> > > my outbound ftp traffic to 40 Kbytes per second.

Could you post the bits of the proftpd config that do this - I have (but 
rarely use) proftpd and could test.

> > > The only way I can see to do this is limit by marking packets with
> > > iptables.  I am marking traffic on 65436 which is the active ftp data
> > > port (65437-1) and 50000-60000.  Outbound shaping is working
> > > fine....however....inbound ftp traffic is also being shaped to 40K.  I
> > > have no idea why.

Is this when there is ftp traffic both ways or just inbound?

> > > Seems to me the below rules should mark outbound packets and shape only
> > > outbound packets.  I dont understand why inbound packets are getting 
> > > shaped.
> > >
> > > Here is the script:
> > > #!/bin/bash
> > > #shaping passive and active outbound ftp traffic on an internal computer
> > > without affecting inbound and lan speed
> > >
> > > # mark the outbound passive ftp packets on ports 50000-51000
> > > iptables -t mangle -N MYSHAPER-OUT
> > > iptables -t mangle -I OUTPUT -o eth0 -j MYSHAPER-OUT
> > >
> > > iptables -t mangle -A MYSHAPER-OUT -p tcp --sport 65436 -j MARK
> > > --set-mark 20
> > > iptables -t mangle -A MYSHAPER-OUT -p tcp --sport 50000:51000 -j MARK
> > > --set-mark 20
> > > iptables -t mangle -A MYSHAPER-OUT -m mark --mark 0 -j MARK 
> > > --set-mark 26
> > >   
> >
> >
> > 1) Are you sure these rules are correctly marking and that the marks
> > exist at the time the tc filter sees the packet?  My hunch is NOT. 
> > ASIDE: We _really_ need a way for filters to report hit counts!
> >
> >  
> No, I am not sure.  I have used the command 'watch -n1 tc -s class ls 
> dev eth0' to see the packets flying but i dont really know how to make 
> sure they are being marked correctly.  I must assume that ALL packets on 
> ports 65436 and 50000-510000 are being marked because they are being 
> shaped.  Just not sure why incoming packets are being markek and 
> shaped.  Outbound shaping is working just fine.

You can see counters for iptables rules with iptables -t mangle -L -v -n

Andy.

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