I have the same issue.  There is a way with linux using iptables to mangle
the ToS in the IP header, which solves this issue.

http://www.tldp.org/LDP/nag2/x-087-2-firewall.tos.manipulation.html

But i'm unaware of any way ipf to do this.

Sincerely,

Scott Pakula
Smoothco.com

--- "Dave Ockwell-Jenner" <[EMAIL PROTECTED]> wrote:
> My ISP provides me a very asymmetric cable connection to the Internet.
> I have a Solaris 7 system with IP Filter that acts as a
> router/firewall/NAT between the Internet and the local network in our
> house - effectively sharing the Internet connection between people in
> the house.
>  
> Occasionally, someone fires up a P2P application and the sudden flood of
> upload traffic increases the latency for download traffic (I assume as
> upload becomes saturated, the ACK's for download traffic don't get out
> fast enough).
>  
> Is there some kind of traffic shaping software (preferably freeware)
> that I can use to throttle my upstream traffic and bring things to a
> sensible compromise?
>  
> Kind regards, 
> --
> Dave Ockwell-Jenner
> Solar Nexus Solutions
> http://www.solar-nexus.com/
> 
> 

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