Re: [LARTC] packet shaping bridge

[Jason Bath <jbath@ckua.org>]

Just a follow-up at this point.  No matter what I do to tweak all 
traffic goes to the default queue even though I have tc filters in 
place.  Any suggestions?

Jason Bath
Network Administrator
CKUA Radio Network
780.428.2017


Jason Bath wrote:
> Hi all,
> 
> I'm new to using iproute2 for traffic shaping but not new to Linux. 
> Essentially I have a WAN between two cities that I stream audio over for 
> rebroadcast.  Since it's all done live stability and prioritization is 
> critical in staying on air for our radio broadcasts.
> 
> My WAN is  1.5Mbit PVC within my provider's infrastructure so I have an 
> unencrypted direct line via DSL to my remote site.  My streaming devices 
> use between 300 and 600kilobits/sec. with plenty of room for the 
> workstations/servers at the remote site.  Unfortunately as we all know, 
> typical applications like web, mail, windows file sharing, etc are 
> bursty and pigs for the bandwidth.  This results in audio that's choppy 
> and drops off for seconds to minutes.  I know there's enough bandwidth 
> to go around but I need limits set.
> 
> I've created a bridge called edmbr on a Mandrake 10.1 server with 2 
> nics.  The bridge works just great thanks to Don's script from 
> burnpc.com.  The problem I've run into is in testing my filtering. After 
> fixing the bugs in my first script I went to tweaking its settings.
> 
> I'm using htb as it seems simpler for me to use at the moment. For some 
> unknown reason to me all traffic is being sent to my default classid 
> 1:11.  In the script below my test workstation is the 10.2.1.251 address 
> but all of my traffic goes to 1:11. I'm using  "tc -s -d class show dev 
> eth0" to monitor the traffic.
> 
> Any ideas?  Should I move to CBQ?
> 
> I'm currently tweaking but this is what I have for now:
> -----------------------
> #!/bin/sh
> 
> DEV=eth0
> #setup the root
> 
> #tc qdisc add dev $DEV root handle 1: htb default 11
> tc class add dev $DEV parent 1: classid 1:1 htb rate 100kbps ceil 100kbps
> #Tokyo class
> tc class add dev $DEV parent 1:1 classid 1:10 htb rate 50kbps ceil 100kbps
> #Everything else
> tc class add dev $DEV parent 1:1 classid 1:11 htb rate 50kbps ceil 100kbps
> 
> #filter for streaming
> tc filter add dev $DEV parent 1:1 protocol ip prio 0 u32 match ip src 
> 10.2.1.7 match ip dport 2001 0xffff flowid 1:10
> tc filter add dev $DEV protocol ip parent 1:1 prio 0 u32 match ip src 
> 10.2.1.5 match ip dport 2001 0xffff flowid 1:10
> 
> #filter for my workstation
> tc filter add dev $DEV protocol ip parent 1:1 prio 3 u32 match ip src 
> 10.2.1.251 flowid 1:10
> 
> #all other traffic sent to the other queue
> tc filter add dev $DEV protocol ip parent 1:1 prio 3 u32 match ip src 
> 0.0.0.0/0 flowid 1:11
> 
> 
> tc qdisc add dev $DEV parent 1:10 handle 10: pfifo limit 2
> tc qdisc add dev $DEV parent 1:11 handle 11: sfq perturb 2
> -------------------
> 
> 
> 
> 
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