Re: [LARTC] outbound shaping

[nix4me <nix4me@cfl.rr.com>]

Andy Furniss wrote:

>
>>>> 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.
>
PassivePorts        50000 51000
# Port 21 is the standard FTP port.
Port                65437

>>>> 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?
>
Both ways.

>>>>
>>>> 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.
>
Thanks for helping.

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