<div dir="ltr">Hi Michael,<div><br></div><div>Can you recommend a good SNMP capturing tool and a link to a setup how to? .. I'm really most interested in just seeing how we're doing with our 150/25 circuit and whether or not we should increase/move to fiber/move to symmetrical...</div><div><br></div><div>Thanks!<br><br></div><div>Joshua</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 4, 2018 at 1:37 PM, <span dir="ltr"><<a href="mailto:contact@41magnum.net" target="_blank">contact@41magnum.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<div>Joshua,
<br>
<br>
A network tap might work if you are only looking for mirrored traffic from one port. One thing to keep in mind is
that this is full duplex (TX & RX) so you will most likely need 2 capture interfaces + 3rd for remote access if you
need that. It might be possible to mirror a port off the firewall, but if it's a 1 for 1 mirror you may end up in
a situation where you don't see all the traffic (1Gbps TX + 1Gbps RX on 1Gbos link).
<br>
<br>
If all you are looking for is bandwidth, a SNMP monitoring tool might be a better choice for you. Most of these
will show you the average bandwidth over the polling period. Not precise, but usually good enough.
<br>
<br>
Michael
<br>
<div><span class="">
<div>On Friday, May 4, 2018 at 1:24 PM, Ken D'Ambrosio <<a href="mailto:ken@jots.org" target="_blank">ken@jots.org</a>> wrote:
<br>
</div>
</span><blockquote type="cite">
<div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif"><span class="">
<p>Hey, Joshua. Honestly, you're "doing it wrong," for a few reasons.</p>
<p>* Capturing *everything* would be huge -- almost certainly fill up your hard disk in relatively short order.</p>
<p>* Wireshark isn't the thing to capture it with. If you want that, dump it using "tcpdump" (or its Windows
equivalent), and then look at it later, with Wireshark.</p>
<p>* But, as noted in the initial point, that gets big, VERY fast. Instead, I would recommend just watching
metrics -- does Windows show byte counts on an interface? If so, monitor that minute-by-minute. Or --
probably an even better choice -- get some software that will monitor per-IP usage. Though others may have actual
suggestions on software to use, as I don't.</p>
<p>However, NONE of that will even work if you don't have a switch set up with port mirroring. Ethernet these
days is switched, which means that simply plugging into the same switch will only show you broadcast traffic, not
point-to-point traffic. So you'd miss out on something like 99% of the data. Given the scenario you mention
(basically, "Comcast modem"), I think you'll probably need to pick up a smart Ethernet switch -- one that has port
mirroring -- to even get started down this road.</p>
<p>All of this is relatively non-trivial, but could probably be worked through if you're really trying to make it
happen.</p>
<p>-Ken</p>
<p> </p>
<p>On 2018-05-04 13:09, jsf wrote:</p>
</span><blockquote type="cite" style="padding:0 .4em;border-left:#1010ff 2px solid;margin:0">
<div dir="ltr"><span class="">Hi friends,
<div> </div>
<div>I am IT dir. at a small independent school in CT nowadays. I have a comcast modem. my firewall plugs
into a wired port in the comcast modem. I have an old PC running windows 8.1. I have installed wireshark on
the old PC. I have plugged the old PC's network interface into another wired port on the comcast modem.
Ideally I would like to use wireshark to capture EVERYTHING going across the modem - basically everything that is going
in and out of the connection between the modem and my firewall. I am at a loss w/r/t how to set this up
properly.</div>
<div> </div>
<div>a step-by-step how to, or even a quick shared screen session or phone call would be appreciated.</div>
<div> </div>
<div>I am trying to get a sense regarding the schools' bandwidth usage.. we have 150/25 over coax. i think
performance is pretty good most of the time (we are a small school).. but not everyone agrees with me. If we have
too little bandwidth (are hitting a max periodically) I'd like to know that.</div>
<div> </div>
<div>Thanks in advance for help with this and recommendations about anything else I should put on this old PC to help
with this exercise.</div>
<div> </div>
<div>best wishes,</div>
<div> </div>
</span><div>Joshua
<div> </div><span class="HOEnZb"><font color="#888888">
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