Date: Mon, 16 Nov 1998 08:48:48 -0500 (EST) From: George Uhl <uhl@mamba-e.gsfc.nasa.gov> To: lubnazia@cyberaccess.com.pk, nick@dcs.shef.ac.uk Cc: freebsd-questions@FreeBSD.ORG Subject: Re: bandwith monitor for unix freebsd Message-ID: <199811161348.IAA22753@mamba-e.gsfc.nasa.gov>
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> From majordom@FreeBSD.ORG Mon Nov 16 06:28 EST 1998 > Delivered-To: vmailer-questions@freebsd.org > Date: Mon, 16 Nov 1998 11:14:23 +0000 > From: "Nick A. Fikouras" <nick@dcs.shef.ac.uk> > MIME-Version: 1.0 > To: lubnazia@cyberaccess.com.pk > Cc: freebsd-questions@FreeBSD.ORG > Subject: Re: bandwith monitor for unix freebsd > Content-Transfer-Encoding: 7bit > X-Loop: FreeBSD.ORG > > > > Lubna Zia wrote: > > > Can we somehow control the bandwith being used by the customers at an > > ISP with the help of any relevant s/w tool available for unix freebsd? > > Is there a bandwith monitor available for unix freebsd? > > > For traffic control and bandwidth management look at ALTQ: http://www.csl.sony.co.jp/person/kjc/kjc/software.html One of the ALTQ traffic control disciplines, CBQ, has a graphical traffic monitoring capbility. Then there is ttt, which is a graphical derivative of tcpdump. You can get ttt from the ALTQ page or from the freebsd ports collection. > When we are talking about TCP/IP network, as far as I know IP is a best > effort protocol. That is, it performs its best to deliver traffic as fast > as it can. It is this characteristic of IP that makes it impossible (with > the current router infrastructure) to reserve or allocate bandwidth in the > Internet. > Absolutely not true! Cisco supports traffic shaping, packet prioritization, weighted fair queueing, etc. right now. There is a lot of work on implementing different queuing disciplines to support bandwidth reservation. Don't forget the work being done by the IETF to define diffserv which will make QoS a reality in the internet. You are correct in one sense, the desired bandwidth reservation can break down if at least one router along the flow path cannot provide support for that reservation. > I hope this has been of help, > > nick > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message George Uhl To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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