FreeBSD Traffic Shaping

freebsd at freebsd at
Wed Apr 2 07:27:25 UTC 2008

I gave port 80 as an example but I need this configuration for  
limiting other services as well.

If you have a 100mbps connection and only one client, you want him to  
only use 50kbps, not the full pipe. If you have 200 clients, they  
still get 50kbps each.

Is this feature that I need so complicated that it can't be  
implemented easily into FreeBSD or is it that not many people need it  
? It sounds quite useful to me :)

> I have personally tried that before and it did not worked as described, in
> fact it didn't work at all to limit anything on FBSD6.
> -----Original Message-----
> From: owner-freebsd-questions at
> [mailto:owner-freebsd-questions at] On Behalf Of Christopher Cowart
> Sent: Tuesday, April 01, 2008 7:55 PM
> To: freebsd at
> Cc: freebsd-questions at
> Subject: Re: FreeBSD Traffic Shaping
> freebsd at wrote:
>> I am trying to limit the bandwidth available to some connections and
>> I'm not sure FreeBSD can handle this. Maybe some of you can help.
>> Here's what I need to have exactly.
>> No matter what the number of connections, each connection should have
>> at most/least 50kbps guaranteed outbound on port 80.
>> I've tried dummynet but it doesn't do what I need because if I define
>> a pipe with 1mbps and if I have 1000 connections, each connection will
>> have less than 50kbps.
>> Any way to do this in FreeBSD ?
> The ipfw(8) man page describes a "mask" configuration parameter.
> # /sbin/ipfw pipe 1 config mask src-ip 0xffffffff bw 56Kbit/s
> This creates a separate dynamic pipe per source ip address. Each pipe has a
> dedicated 56kbps. The man page implies that the mask can combine fields, so
> to uniquely identify "each connection", you would mask all bits of source
> and destination IP and ports. It looks like the "all"
> keyword might do just the trick.
> --
> Chris Cowart
> Network Technical Lead
> Network & Infrastructure Services, RSSP-IT UC Berkeley
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