[rescue] What is this traffic?

microcode at zoho.com microcode at zoho.com
Thu Oct 29 07:28:55 CDT 2015

On Thu, Oct 29, 2015 at 08:02:42AM -0400, Carl R. Friend wrote:
> On 10/29/2015 07:45 AM, microcode at zoho.com wrote:
> >Is there any way to see what the traffic between the router and the switch
> >is without extra equipment? Does anybody have any idea what this could be?
>    Since you're dealing with switches (likely both in the router and
> the one that connects your internal network together) you're not going
> to see any of that traffic unless you can mirror a port one either one
> of the devices.  If there's no way to do that, then the only way you'll
> be able to see it is to put a *hub* in between the router and the switch
> and then sniff another port on the hub.

I don't have one and getting one would be difficult. I understand the
limitation, I hoped I was missing something. How annoying it happens where I
can't look at it...

>    My guess is that you've got some sort of spanning-tree protocol
> that's somehow creating a lot more traffic than it should.  If you
> are *never* going to plug another device into the switch in the router
> try disabling BPDUs (or somesuch) on the internal switch to see if it
> makes a difference.

There is no management interface on the switch unfortunately. I can't even
find a reset hole on it.

Thank you.

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