Date: Sat, 3 Jan 2009 14:03:57 -0200 From: "=?UTF-8?Q?Sd=C3=A4vtaker?=" <sdavtaker@gmail.com> To: "Kurt Buff" <kurt.buff@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Tool for traffic measure? Message-ID: <c37d69f60901030803n2489d4c8n941c196f92ee0c84@mail.gmail.com> In-Reply-To: <a9f4a3860901022200s3de40fdcyf57a5e009f9d36ca@mail.gmail.com> References: <c37d69f60901022121t4d0f8e5dyd43c1eac76478c18@mail.gmail.com> <a9f4a3860901022200s3de40fdcyf57a5e009f9d36ca@mail.gmail.com>
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Thanks for the info, i got a linksys SD208: http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1123638180923&pagename=Linksys%2FCommon%2FVisitorWrapper&lid=8092322279B03 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, Sdävtaker <sdavtaker@gmail.com> wrote: >> Hello, >> I got a subnet with 5 machines and a cablemodem who provides 5 public ips >> 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 > -- Sdävtaker prays to Rikku goddess for a good treasure.help
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