Date: Fri, 18 May 2001 02:53:31 -0500 From: Will Andrews <will@physics.purdue.edu> To: Ted Mittelstaedt <tedm@toybox.placo.com> Cc: Will Andrews <will@physics.purdue.edu>, questions@FreeBSD.ORG Subject: Re: Promiscuous mode? Message-ID: <20010518025331.S26877@casimir.physics.purdue.edu> In-Reply-To: <005001c0df6c$56820f00$1401a8c0@tedm.placo.com>; from tedm@toybox.placo.com on Fri, May 18, 2001 at 12:29:56AM -0700 References: <20010518012637.Q26877@casimir.physics.purdue.edu> <005001c0df6c$56820f00$1401a8c0@tedm.placo.com>
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On Fri, May 18, 2001 at 12:29:56AM -0700, Ted Mittelstaedt wrote: > Under FreeBSD, programs like trafshow are "bpf clients" they > use the bpf interface which puts the card in promiscious mode. I know that. > In your scheme, however, that hub that the DSL line is connected to > and that the BSD box and the other computers are connected to, > it MUST be a flat hub, NOT a switch. Switches will normally > prevent all the traffic from being seen. As long as it's a hub > you will be fine. I also know that. It is indeed a hub and not a switch. :) > the snmp daemon only looks at traffic that is directed to the > computer, not at all traffic on the Ethernet. Ouch. That's not good. Perhaps I'll have to try some other method of getting the data octet counts. If I do that at least I'll be able to get rid of the SNMP daemon.. SNMP isn't granular enough anyway; I'd prefer to graph the usage per IP address rather than per interface. Perhaps I'm missing something, but anyway... > BTW, what is the DSL CPE that your using to connect to the DSL line? > Some of the CPE's have SNMP in them and can give you traffic stats > that you can track with a program like MRTG. I don't know what a "CPE" is, but the gateway my system is connected to doesn't respond to SNMP requests. :( I forgot to mention that currently all traffic goes through one IP address so I'm currently able to use mrtg to graph the usage through net-snmp on localhost. That's changing soon though, hence why I'm asking about these things. So I guess all I need is to figure out how to get the octet counts on the external interface once the network topology changes. TIA, -- wca To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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