Networking Question Regarding Gigbit Ethernet
Mike Bydalek
mike.bydalek at gmail.com
Sun Jul 1 14:44:25 MST 2012
Like I said, I've seen auto-negotiation sometimes go wonky, even in the
cases where ethtool reports correctly. If everything in your network is
okay except this device, hard code it to 100/full through the web UI.
I would say its your switch, but you tried different ports. How about the
cable? Swap with a known good one. Process of elimination here.
Regards,
Mike
On Jul 1, 2012, at 2:39 PM, Mark Phillips <mark at phillipsmarketing.biz>
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 <mark at phillipsmarketing.biz>wrote:
> So I need to run this on the MLB?
>
> Mark
> On Jul 1, 2012 1:36 PM, "James Mcphee" <jmcphe at gmail.com> wrote:
>
>> As such. You need to use whatever eth device you have, of course.
>>
>> jmcphee at 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 <mark at phillipsmarketing.biz
>> > wrote:
>>
>>> How do I use ethtool to answer your question?
>>>
>>> Mark
>>>
>>>
>>> On Sun, Jul 1, 2012 at 12:52 PM, James Mcphee <jmcphe at 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 <
>>>> mark at 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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>>>>
>>>>
>>>>
>>>> --
>>>> James McPhee
>>>> jmcphe at gmail.com
>>>>
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>>>
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>>
>>
>>
>> --
>> James McPhee
>> jmcphe at gmail.com
>>
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>
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