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Re: Traffic Shaping over Satellite Internet

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Shaping on satellite can be a bad idea. Depends on who your provider is.
Some satellite providers use SCPS http://www.scps.org/ as a means to
increase performance. Simply put if you start shaping and drop ACK's you
will end up with connections hangs. 

I am really surprised we do not hear more about SCPS in this forum. 


On Thu, 2007-03-15 at 12:11 +0300, Randy Wallace wrote:
> I've set up Traffic Shaping on a Linux Router.
> Using HTB with SFQ, i'm trying to slow down
> heavy downloading for 20 subscribers over
> a 2048 kbit downlink.  I'm classifying internet related
> traffic using iptables marking.
> 
> bri0 is my local lan bridge, receiving egress traffic destined for subscribers.
> 
> tc qdisc add dev bri0 root handle 1: htb default 2
> tc class add dev bri0 parent 1: classid 1:1 htb rate 92129kbit ceil 102400kbit
> tc class add dev bri0 parent 1:1 classid 1:2 htb rate 90072kbit ceil 92129kbit
> tc class add dev bri0 parent 1:1 classid 1:3 htb rate 2048kbit ceil 92129kbit
> # Non-Internet Local Lan Traffic
> tc qdisc add dev bri0 parent 1:2 handle 2: sfq perturb 10
> # Internet Traffic
> tc class add dev bri0 parent 1:3 classid 1:9 htb rate 50kbit ceil 100kbit
> # Unknown Internet Traffic
> tc qdisc add dev bri0 parent 1:9 handle 9: sfq perturb 10
> # Known Subscribers, based on IP Address, ea. subscriber gets their own class,
> # starting with 1:10 (a script populates the classes for me)
> tc class add dev bri0 parent 1:3 classid 1:(10->X) htb rate 100kbit ceil 400kbit
> tc qdisc add dev bri0 parent 1:(10->X) handle (10->X): sfq perturb 10
> 
> Then the classifier:
> # Send Internet traffic, marked 3, to Class 1:3
> tc filter add dev bri0 protocol ip parent 1: prio 1 handle 3 fw flowid 1:3
> # Send traffic, based on dest. IP to their corresponding classes
> tc filter add dev bri0 protocol ip parent 1: prio 1 u32 match ip dst
> 10.200.0.(2->X)/32 flowid 1:((2->X) + 10)
> 
> Does this look like a good solution?  Can this really slow down heavy downloads,
> so all subscribers can at least get ..some.. traffic?  Does traffic
> shaping, not
> policing, also drop packets when a HTB class exceeds it's rate, or does it just
> wait until there are enough tokens?
> 
> Thank you for any guidance..
> Randy
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