[rescue] What is this traffic?

[patrick at zill.net]

Could it be an auto-negotiation problem? Or mismatched speed/duplex?

On October 29, 2015 6:24:09 AM MDT, microcode at zoho.com wrote:
>On Thu, Oct 29, 2015 at 12:54:27PM +0100, Jonathan Katz wrote:
>> On Thu, Oct 29, 2015 at 12:45 PM,  <microcode at zoho.com> wrote:
>> > I have no evidence of anything getting to any of the boxes on my
>LAN. iptraf
>> >
>> > 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?
>> 
>> The extra equipment part is difficult. If you're willing to sacrifice
>> network performance in the short-term dust off an old 10Mbit hub in
>> the closet and put that between the ADSL router and the switch and
>> then run snoop or tcpdump on something plugged into the hub.
>
>I don't have any other switches or hubs. I'm really hurting for
>equipment.
>The network performance I am getting is so bad I don't think
>sacrificing it
>is a possibility! I am paying for 15Mb/s and getting 1.5M on a good
>day. For
>about two years it was fine and then for the last two it has gotten
>worse
>and worse. It's a blame game between the carrier and the ISP and
>although I
>am sure it's the ISP I can't get them to fix it. There are very few
>providers and it's not clear switching would help although I will
>anyway
>shortly I hope.
>
>> How dumb is your TP-Link switch? Could it take dd-wrt or similar?
>That
>> could allow you to mirror the interface between the switch and the
>> ADSL router and you can snoop traffic that way.
>
>Ah, no, it's an unmanagemed switch and not user flashable as far as I
>know. There is no management interface and nothing but RJ-45 ports.
>
>> Alternately, does it happen at a set interval? Like every "N" hours
>> after the ADSL modem has been rebooted? I'm wondering if it is some
>> kind of standard ARP broadcast/mapping that is going on as a part of
>> spanning tree. Like the ADSL port keeps a cache of the MAC addresses
>> that it expects to find beyond the switch port it is plugged into.
>
>The light goes crazy whenever the switch is connected to the router. I
>have
>not seen anything that gives me any clues apart from that. The light is
>flashing at a high rate all the time, regardless of traffic from any of
>the
>boxes on my network.
>
>Thanks.
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