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Date:      Sat, 28 Mar 1998 11:13:13 -0500
From:      Howard Goldstein <hgoldste@bbs.mpcs.com>
To:        freebsd-hackers@FreeBSD.ORG
Cc:        danj@3skel.com
Subject:   Re: Network throttle...
Message-ID:  <199803281613.LAA21072@bbs.mpcs.com>
In-Reply-To: <351D18B4.EBDE1C28@3skel.com>

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danj wrote:
 : 
 : I am looking for a way to create a lower bandwidth restriction on an
 : interface. I have an ethernet interface that I want to restrict to a
 : maximum
 : of T1 throughput.
 : 
 : 1. Is there a way to do this (easy or kernel hacking)

Easy, yes.  ALTQ.  See http://www.csl.sony.co.jp/person/kjc/programs.html

 : What happens, i.e. the mechanics, when there is a higher
 : capacity link feeding into a lower capacity link. Where does all
 : the data go? I know it is buffered to an extent, but that has limits.
 : Do the packets get dropped? 

Under ALTQ, after free space in the delay queue is exhausted, yes they
are dropped.  

 : I seem to remember an ICMP type that
 : indicates transmission of too much data and for the sender to cut back
 : or something.

Not sure if source quenching is part of ALTQ...

 : Triskelion Systems, Inc.

I wager 50 quatloos you'll like it...


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