Date: Sat, 3 Jan 2009 10:37:30 -0800 From: "Kurt Buff" <kurt.buff@gmail.com> To: "=?ISO-8859-1?Q?Sd=E4vtaker?=" <sdavtaker@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Tool for traffic measure? Message-ID: <a9f4a3860901031037i569892cq8c71b3c92e9259f5@mail.gmail.com> In-Reply-To: <c37d69f60901030803n2489d4c8n941c196f92ee0c84@mail.gmail.com> References: <c37d69f60901022121t4d0f8e5dyd43c1eac76478c18@mail.gmail.com> <a9f4a3860901022200s3de40fdcyf57a5e009f9d36ca@mail.gmail.com> <c37d69f60901030803n2489d4c8n941c196f92ee0c84@mail.gmail.com>
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On Sat, Jan 3, 2009 at 8:03 AM, Sd=E4vtaker <sdavtaker@gmail.com> wrote: > Thanks for the info, i got a linksys SD208: > http://www.linksys.com/servlet/Satellite?c=3DL_Product_C2&childpagename= =3DUS%2FLayout&cid=3D1123638180923&pagename=3DLinksys%2FCommon%2FVisitorWra= pper&lid=3D8092322279B03 > It got 0 intelligence, right? > Thanks for the replies > Sdav > > On Sat, Jan 3, 2009 at 4:00 AM, Kurt Buff <kurt.buff@gmail.com> wrote: >> On Fri, Jan 2, 2009 at 9:21 PM, Sd=E4vtaker <sdavtaker@gmail.com> wrote: >>> Hello, >>> I got a subnet with 5 machines and a cablemodem who provides 5 public i= ps >>> All is conected to a switch. >>> One of the machines is not ours and we want to check it is not >>> abuseing our internet link, so we want to know if there is any way to >>> monitor bandwich usage from one of the other machines in the subnet >>> with no need to modify the foreing machine config. Something like use >>> tcpdump in promiscuos mode or something like that, we doesnt matter >>> the content, we just need a bandwich conssumption meassure. >>> Thanks for any ideas. >>> Sdav >> >> You have several options: >> >> 1) If the switch has some intelligence, you can monitor it to measure >> bandwidth consumption. There are two ways to do this: >> a) if the switch implements SNMP, you can use mrtg (simple) or >> cacti (not so simple) to graph bandwidth on the switch by port and in >> total >> b) if the switch can mirror all of the data going across the >> switch to a port on the switch, you can use ntop to graph traffic. It >> only shows the top three bandwidth consumers at any given time, but i) >> it does have very nice graphing, and if the machine you are concerned >> about is consuming more than its fair share it will show, and ii) you >> can use standard bpf filters to capture utilization for just that box. >> >> 2) if you have a spare machine, you can put two NICs in it, and use it >> as a bridge between the switch and the router. This is a bit more >> complicated, but it allows you to implement either option 1a or 1b >> above. >> >> Kurt Yes, the switch has zero intelligence. You'll either need another switch, or a spare PC with two NICs. Kurt
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