Re: Networking Question Regarding Gigbit Ethernet

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Author: Mark Phillips
Date:  
To: michael, Main PLUG discussion list
Subject: Re: Networking Question Regarding Gigbit Ethernet
Well, the update finished, but I am still getting over 50% packet loss when
I ping the device. I guess back to costco it goes.

Mark

On Sun, Jul 1, 2012 at 3:05 PM, Mark Phillips <>wrote:

> The device is now updating the firmware......and there are no packets lost
> on pings to the device or pings from the device.
>
> Mark
>
>
> On Sun, Jul 1, 2012 at 2:53 PM, Michael Butash <> wrote:
>
>> Unless you have a managed switch, don't force negotiation, as it'll just
>> cause the switch to run in 10base/half-duplex (lowest common denominator)
>> when there is no negotiation advertised. It's sitting in 100/full already,
>> which is what you want.
>>
>> If you do ifconfig eth0, do you see any errors? Collisions and CRC
>> errors will stack if there is a negotiation problem. Seems like either the
>> switch or phy port on the mybook is wack, but doesn't make a lot of sense
>> you'd lose that much anyways. Try different switch port/cable if there are
>> errors.
>>
>> Have you tried pinging from the mbl itself to the gateway or other hosts?
>> Could be they have some kind of input iptables filter
>> rate-limiting/shaping packets or some such, but unlikely.
>>
>> -mb
>>
>>
>>
>> On 07/01/2012 02:39 PM, Mark Phillips wrote:
>>
>>> I was able to ssh into the MBL and it has ethtool installed -
>>>
>>> MyBookLive:~# ethtool eth0
>>> Settings for eth0:
>>>      Supported ports: [ MII ]
>>>      Supported link modes:   10baseT/Full
>>>                              100baseT/Full
>>>                              1000baseT/Full
>>>      Supports auto-negotiation: Yes
>>>      Advertised link modes:  10baseT/Full
>>>                              100baseT/Full
>>>                              1000baseT/Full
>>>      Advertised auto-negotiation: Yes
>>>      Speed: 100Mb/s
>>>      Duplex: Full
>>>      Port: MII
>>>      PHYAD: 1
>>>      Transceiver: external
>>>      Auto-negotiation: on
>>>      Link detected: yes
>>> MyBookLive:~#

>>>
>>> So, it should work on 100baeT. Any thoughts on why I am loosing so many
>>> packets?
>>>
>>> Mark
>>>
>>> On Sun, Jul 1, 2012 at 2:09 PM, Mark Phillips
>>> < <mailto:mark@**phillipsmarketing.biz<>>>
>>> wrote:
>>>
>>>     So I need to run this on the MLB?

>>>
>>>     Mark

>>>
>>>     On Jul 1, 2012 1:36 PM, "James Mcphee" <
>>>     <mailto:jmcphe@gmail.com>> wrote:

>>>
>>>         As such.  You need to use whatever eth device you have, of
>>> course.

>>>
>>>         jmcphee@locus ~ :) $ sudo ethtool eth2
>>>         Settings for eth2:
>>>                  Supported ports: [ TP MII ]
>>>                  Supported link modes:   10baseT/Half 10baseT/Full
>>>                                          100baseT/Half 100baseT/Full
>>>                                          1000baseT/Half 1000baseT/Full
>>>                  Supported pause frame use: No
>>>                  Supports auto-negotiation: Yes
>>>                  Advertised link modes:  10baseT/Half 10baseT/Full
>>>                                          100baseT/Half 100baseT/Full
>>>                                          1000baseT/Half 1000baseT/Full
>>>                  Advertised pause frame use: Symmetric Receive-only
>>>                  Advertised auto-negotiation: Yes
>>>                  Link partner advertised link modes:  10baseT/Half
>>>         10baseT/Full
>>>                                                       100baseT/Half
>>>         100baseT/Full
>>>                  Link partner advertised pause frame use: Symmetric
>>>                  Link partner advertised auto-negotiation: Yes
>>>                  Speed: 100Mb/s
>>>                  Duplex: Full
>>>                  Port: MII
>>>                  PHYAD: 0
>>>                  Transceiver: internal
>>>                  Auto-negotiation: on
>>>                  Supports Wake-on: pumbg
>>>                  Wake-on: g
>>>                  Current message level: 0x00000033 (51)
>>>                                         drv probe ifdown ifup
>>>                  Link detected: yes

>>>
>>>
>>>         On Sun, Jul 1, 2012 at 1:22 PM, Mark Phillips
>>>         < <mailto:mark@**phillipsmarketing.biz<>

>>> >>
>>>
>>>         wrote:

>>>
>>>             How do I use ethtool to answer your question?

>>>
>>>             Mark

>>>
>>>
>>>             On Sun, Jul 1, 2012 at 12:52 PM, James Mcphee
>>>             < <mailto:jmcphe@gmail.com>> wrote:

>>>
>>>                 What does ethtool tell you about what the interface
>>>                 thinks it is?

>>>
>>>                 On Sun, Jul 1, 2012 at 12:44 PM, Mark Phillips
>>>                 <
>>>                 <mailto:mark@**phillipsmarketing.biz<>>>
>>> wrote:

>>>
>>>                     I have a 100baseT network with several Debian
>>>                     servers, a mac book, and some virtual windows. I
>>>                     just picked up a Western Digital My Book Live (MBL)
>>>                     2TB NAS at Costco, and powered it up on my network.
>>>                     The unit is just sitting with its green light on,
>>>                     and the web interface is really slow. When I ping
>>>                     the device, it shows somewhere from 50% to 86%
>>>                     packet loss. If I ping any other computer on the
>>>                     network I have 0% packet loss. I have tried moving
>>>                     the device to different physical plugs, and I get
>>>                     the same results.

>>>
>>>                     ping results for the MBL from server A:
>>>                     --- 192.168.25.213 ping statistics ---
>>>                     330 packets transmitted, 152 received, 53% packet
>>>                     loss, time 329555ms
>>>                     rtt min/avg/max/mdev = 0.208/0.273/0.650/0.048 ms

>>>
>>>                     --- 192.168.25.213 ping statistics from server B ---
>>>                     254 packets transmitted, 120 received, 52% packet
>>>                     loss, time 252998ms
>>>                     rtt min/avg/max/mdev = 0.196/0.264/2.499/0.206 ms

>>>
>>>
>>>                     ping results for  server A to B:
>>>                     --- 192.168.25.130 ping statistics ---
>>>                     340 packets transmitted, 340 received, 0% packet
>>>                     loss, time 338996ms
>>>                     rtt min/avg/max/mdev = 0.080/0.177/0.246/0.030 ms

>>>
>>>                     The device says gigabit Ethernet next to the
>>>                     Ethernet port. Is there any reason I can't connect a
>>>                     gigabit Ethernet device to a 100baseT network other
>>>                     than the obvious speed difference? Should I see all
>>>                     this packet loss? This is actually the second unit I
>>>                     have tried - the first one acted the same way, so I
>>>                     took it back. I am now wondering if I am doing
>>>                     something wrong.

>>>
>>>
>>>                     Thanks!

>>>
>>>                     Mark

>>>
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>>>                  <mailto:jmcphe@gmail.com>

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