Problem while using HTB bandwidth limitation

Linux Advanced Routing and Traffic Control

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Hello everyone,

I am using htb to shape bandwidth but I can see heavy ups and downs from the specified limit. I have seen users with 24Kbit limitation can reach upto 36Kbit.

Can there be any problem if I set 10 classes each restricted to 24kbit under a class which has been restricted to 128Kbit.

My point is what happens if total of child classes, is more than the parent class itself. Does it distribute fairly ie equally to all 10 classes or will there be a problem.

I want it to be this way because I know not all 10 people use it simultaneously there can be 7 people at max who will be browsing at same time.

Here are some rules:

#Creating root qdisc
tc qdisc add dev eth0 root handle 1: htb default 4000

tc c a dev eth0 parent 1: classid 1:1 htb rate 192Kbit burst 15Kbit

#Rules for default class
tc c a dev eth0 parent 1:1 classid 1:4000 htb rate 16Kbit burst 10Kbit
tc q a dev eth0 parent 1:4000 handle 4000: sfq perturb 10

# Rules for each of the 10 machines
tc c a dev eth0 parent 1:1 classid 1:$C_ID htb rate 24Kbit burst 10Kbit


tc q a dev eth0 parent 1:$C_ID handle $C_ID: sfq perturb 10
tc f a dev eth0 protocol ip parent 1: prio 5 u32 match ip dst $IP classid 1:$C_ID



With regards, Nimit

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