Re: [LARTC] IP based bandwith limit

[Christoph Petersen <lists@peterschen.de>]

Hi,

okay, but I think I have some problems understanding the interaction 
between upload and download. How I have to define my traffic classes to 
match upload and download depending on each other?

Greets
Christoph

Peter Huetmannsberger wrote:

>Hi 
>
>like I said, I am new too, so take this with a grain of salt. 
>
>  
>
>>unfortunately there is only one interface for the customers. My problem 
>>is to limit the up AND down speed in dependence to each other.
>>    
>>
>
>Downloads become uploads on your internal interface!
>
>so if eth0 is your external interface a download would be INCOMING on eth0 
>but as it is going on to your internal interface (e.g. eth1) it becomes an 
>upload to your customer. So incoming traffic from the internet to your 
>customers is outgoing on eth1. 
>
>if you do this on eth1: 
>--------------
>#!/bin/bash
>tc qdisc add dev eth1 root handle 1: htb default 20
>tc class add dev eth1 parent 1: classid 1:1 htb rate 90mbit burst 15k
>tc class add dev eth1 parent 1:1 classid 1:10 htb rate 10mbit 
>                                                      prio 0 burst 15k
>tc class add dev eth1 parent 1:1 classid 1:20 htb rate 1mbit ceil 1mbit
>						      burst 6k prio 1
>U32="tc filter add dev eth1 protocol ip parent 1:0 prio 0 u32"
>$U32 match ip dst 192.168.1.19 flowid 1:10
>---------------
>
>Then you have split the traffic into two classes: 
>
>one for the preferred customer, who gets 10Mbit and a default for all the 
>other traffic, which gets 1Mbit. It still leaves a lot of bandwidth 
>unused! (79 Mbit)
>
>I have made the experience (which cost me an awful lot of time) that 
>assuming the interface woudl produce excactly 100Mbit is a mistake and htb 
>does unexpected things. It is probably bets to lower the parent class 
>trafic 1: to something about 10% below your actual internet connection, 
>even on your internal interface. (Please correct me if I am completely 
>wrong!) I used iptraf to have a look on the throughput. 
>
>
>You would have to do something similar for actual uploads from your 
>customers to the internet on eth0, but as you probably nat the traffic I 
>am not certain what you would do there! Anyone else?
>
>greetings, 
>
>.peter
>
>
>
>  
>

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