[ale] Ethernet bandwidth choker

[Dow Hurst]

Add the rate limiting to both interfaces of your router/firewall in 
between the two feeds your wanting to work with.  That way you 
completely control the bandwidth thru the router.  Also with tweaking 
iptables and the tc rate limiting you can pick what is limited.  The 
advanced routing howto has a lot of info and links on this subject.  You 
can limit down to modem speeds and up to the bandwidth of your feeds.  
It is very versatile.
Dow


Michael Still wrote:

>On Wed, 8 Dec 2004 06:45:41 -0500, David Corbin <dcorbin at enttek.com> wrote:
>  
>
>>I need a device that I can use to simulate low-bandwidth between two ethernet
>>machines.  Ideally,  the box would have some limited interface to enter in  a
>>desired bandwidth to simulate.  Something that works in increments of 64kbs
>>would be fine.
>>
>>1) Is there a correct name for such a product.
>>2) Any recommendations?
>>
>>    
>>
>You can do this with rate limiting between ethernet interfaces I
>believe.  Here's an example you can play with:
>
>tc qdisc add dev eth0 root handle 1: cbq avpkt 1000 bandwidth 100mbit
>
>tc class add dev eth0 parent 1: classid 1:1 cbq rate 64kbit allot 1500
>prio 5 bounded isolated
>
>tc filter add dev eth0 parent 1: protocol ip prio 16 u32 match ip dst
>0.0.0.0/0 flowid 1:1
>
>It has been my experience that the limiting is not exactly at 64kbits
>(or it might be a problem at higher limits) so you might have to
>change it to get it to work at the right speed.  Once you do find the
>right limit, it does stay under it.  Also this only affects outbound
>traffic, but you can make it affect inbound with more tc filter rules.
>If the interface on the sending side is rate limited though, then I
>wouldn't mess with the inbound limit.
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>  
>