Networking Question Regarding Gigbit Ethernet
Michael Butash
michael at butash.net
Sun Jul 1 14:53:07 MST 2012
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
> <mark at phillipsmarketing.biz <mailto: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
> <mailto: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 <mailto: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 <mailto: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
> <mailto: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 <mailto:jmcphe at gmail.com>
>
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