Help! Instable network on 6.06 based SuperMicro server with e1000 Intel driver

[Floris Vlasveld]

On 24 feb 2008, at 21:49, Aart Koelewijn wrote:

> On Sun, 24 Feb 2008 21:22:23 +0100, Floris Vlasveld wrote:
>
>> On 24 feb 2008, at 16:52, Nick Webb wrote:
>>
>>> Floris Vlasveld wrote:
>>>>
>>>> And, the output of "ethtool eth0" and eth1:
>>>>
>>>> Settings for eth0:
>>>> Supported ports: [ TP ]
>>>> Supported link modes:   10baseT/Half 10baseT/Full
>>>>                       100baseT/Half 100baseT/Full
>>>>                       1000baseT/Full
>>>> Supports auto-negotiation: Yes
>>>> Advertised link modes:  10baseT/Half 10baseT/Full
>>>>                       100baseT/Half 100baseT/Full
>>>>                       1000baseT/Full
>>>> Advertised auto-negotiation: Yes
>>>> Speed: 100Mb/s
>>>> Duplex: Full
>>>> Port: Twisted Pair
>>>> PHYAD: 0
>>>> Transceiver: internal
>>>> Auto-negotiation: on
>>>> Supports Wake-on: umbg
>>>> Wake-on: g
>>>> Current message level: 0x00000007 (7) Link detected: yes
>>>>
>>>> Settings for eth1:
>>>> Supported ports: [ TP ]
>>>> Supported link modes:   10baseT/Half 10baseT/Full
>>>>                       100baseT/Half 100baseT/Full
>>>>                       1000baseT/Full
>>>> Supports auto-negotiation: Yes
>>>> Advertised link modes:  10baseT/Half 10baseT/Full
>>>>                       100baseT/Half 100baseT/Full
>>>>                       1000baseT/Full
>>>> Advertised auto-negotiation: Yes
>>>> Speed: 100Mb/s
>>>> Duplex: Full
>>>> Port: Twisted Pair
>>>> PHYAD: 0
>>>> Transceiver: internal
>>>> Auto-negotiation: on
>>>> Supports Wake-on: umbg
>>>> Wake-on: g
>>>> Current message level: 0x00000007 (7) Link detected: yes
>>>
>>> I have similar SuperMicro servers with no issues.  I'd look first at
>>> the
>>> switch this server is connect to and make sure the ports are set to
>>> auto
>>> negotiate just like your interfaces are.  If they are set to auto
>>> negotiation, then I'd force them to 100/full and do the same to your
>>> server's network cards.  I've seen speed/duplex mismatches cause  
>>> lots
>>> of
>>> odd problems before.
>>>
>>> Aside from that, I'd be looking for hardware issues.  See anything  
>>> odd
>>> in the logs?
>>>
>>>
>>> Nick
>>
>>
>> Thanks for the tips Nick. I've first of all forced eth0 (the  
>> 'external'
>> interface) to operate at 100/Full. However, that didn't stop the
>> problem. I then changed the settings so that eth0 was allowed to
>> negotiate, but only up to 10/Full. Unfortunately, this didn't solve  
>> the
>> problem as well. At this time, I'm not able to force the 3com  
>> switch to
>> operate at 100/full only. However, it should be able to handle both
>> 100/full and 10/full perfectly.
>>
>> Output of ethtool eth0 at this time:
>>
>> Settings for eth0:
>> 	Supported ports: [ TP ]
>> 	Supported link modes:   10baseT/Half 10baseT/Full
>> 	                        100baseT/Half 100baseT/Full
>> 	                        1000baseT/Full
>> 	Supports auto-negotiation: Yes
>> 	Advertised link modes:  10baseT/Full
>> 	Advertised auto-negotiation: Yes
>> 	Speed: 10Mb/s
>> 	Duplex: Full
>> 	Port: Twisted Pair
>> 	PHYAD: 1
>> 	Transceiver: internal
>> 	Auto-negotiation: on
>> 	Supports Wake-on: umbg
>> 	Wake-on: g
>> 	Current message level: 0x00000007 (7) Link detected: yes
>>
>> Hardware issue is of course always possible. However, since both eth0
>> and eth1 display this problem, that seems quite unlikely.
>>
>> Do you or anybody else have any other suggestion?
>>
>> Floris.
>
> With such a problem I would always check route. It has happened to me
> that there are 2 default routes or none at all. In both cases you will
> have problems with your network.
>
> Aart

Thanks for your reply Aart. How exactly would I check that? What do I  
look for?

Output of "route" is as follows:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref     
Use Iface
80.69.93.0      *               255.255.255.128 U     0      0         
0 eth0
10.0.0.0        *               255.255.255.0   U     0      0         
0 eth1
default         10.0.0.1        0.0.0.0         UG    0      0         
0 eth1
default         80.69.93.1      0.0.0.0         UG    0      0         
0 eth0