Re: [LARTC] packet shaping bridge

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Jason Bath wrote:
> Thanks!  Adding the filter to the root was the trick.  From the various 
> documentation I was reading I had the impression that the filter needed 
> to be added to the sub-classes - 1:1 and so forth.  I presume that's 
> only appropriate when you have leaves below 1:1.
> 
> Anyhow, the trick now is figuring out how I want to configure things 
> with two of these bridges in mind.  The topology would look like this:
> 
> Switch-bridge/filter-WAN router--Remote WAN router-bridge-remote switch
> 
> Now with 1.5Mbit/s with the potential for 2mbit/s I was thinking of 
> limiting each bridge at 1Mbit/s. I didn't want to limit at 750kbit/s 
> because if you're doing a big file transfer, you're going to suffer and 
> besides, the ratio of download to upload is in favour of the download 
> The streaming audio devices are set up for 128kbit/s MPEG-layer3.  So 
> we're looking at dedicating a minimum of 150kbit/s which can double or 
> more if I'm having congestion problems.
> 
> Now here's an interesting idea.  Let me know if it's possible or not. Is 
> it possible for me to create a bridge between the two linux boxes so it 
> physically looks like
> 
> eth0 eth1 --WAN--  eth1 eth0
> 
> but virtually you are going
> 
> eth0 ------- eth0
> 
> The reason I ask this is so I can create an awareness between the two 
> bridges as to how much traffic is actually going through the pipe so I 
> may optimize it to its fullest.
> 
> I suppose that it could be done via snmp or spanning-tree?

I don't know if that will work - if you can shape on both ends just do 
egress shaping on the WAN facing interfaces. You'll need to back off a 
bit to allow for link overheads, but it will be alot nicer than doing it 
all from one end.

Andy.
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