what's your MTU size?
Scrive micah milano <micaho@xxxxxxxxx>:
> I've been following the HOWTO, and reading mailing list discussions
> about throttling bandwidth, and have had some success, but I just want
> to tie off some loose ends. Essentially what I am wanting to do is to
> keep our bandwidth usage below 1megabit, because if we go over we get
> charged for that traffic. I've used some of the examples from the
> HOWTO to limit our bandwidth, but I find that it gets limited to
> *half* what I specify. If I specify 256, bandwidth tests (using iperf)
> show that things are clamped at 128, that makes me scared that I am
> doing something right.
>
> I'm using cbq, I've seen some people suggest using htb instead because
> it is more reliable and easier to configure, but I thought i'd get
> what the HOWTO says working first, and then investigate alternatives.
>
> I've got a machine that sits in front of the network, has the internet
> plugged into eth0 and the other side plugged into eth1, and I am doing
> the following:
>
> #!/bin/bash
> LIMITDOWN=256
> LIMITUP=256
> DEV=eth0
> DEV2=eth1
>
> # clean up qdiscs
> tc qdisc del dev $DEV root 2> /dev/null > /dev/null
> tc qdisc del dev $DEV2 root 2> /dev/null > /dev/null
>
> # limit up- and downlink
> tc qdisc add dev $DEV root handle 1: cbq avpkt 1000 bandwidth 100mbit
> tc qdisc add dev $DEV2 root handle 2: cbq avpkt 1000 bandwidth 100mbit
>
> tc class add dev $DEV parent 1: classid 1:1 cbq rate ${LIMITDOWN}kbit \
> allot 1500 prio 5 bounded isolated
> tc class add dev $DEV2 parent 2: classid 2:1 cbq rate ${LIMITDOWN}kbit \
> allot 1500 prio 5 bounded isolated
>
> tc class add dev $DEV parent 1: classid 1:2 cbq rate ${LIMITUP}kbit \
> allot 1500 prio 5 avpkt 1000
> tc class add dev $DEV2 parent 2: classid 2:2 cbq rate ${LIMITUP}kbit \
> allot 1500 prio 5 avpkt 1000
>
> tc filter add dev $DEV parent 1: protocol ip prio 16 u32 match ip dst \
> 0.0.0.0/0 flowid 1:1
> tc filter add dev $DEV2 parent 2: protocol ip prio 16 u32 match ip dst \
> 0.0.0.0/0 flowid 2:1
>
> tc filter add dev $DEV parent 1: protocol ip prio 16 u32 match ip src \
> 0.0.0.0/0 flowid 1:2
> tc filter add dev $DEV2 parent 2: protocol ip prio 16 u32 match ip src \
> 0.0.0.0/0 flowid 2:2
>
> tc qdisc add dev $DEV parent 1:1 sfq perturb 10
> tc qdisc add dev $DEV parent 1:2 sfq perturb 10
>
> tc qdisc add dev $DEV2 parent 2:1 sfq perturb 10
> tc qdisc add dev $DEV2 parent 2:2 sfq perturb 10
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>
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