Bonding and duplicate TCP ACK-s with RedHat ES5

[Tétényi István]

Jeff Larsen wrote:
Dear Jeff,

Thank you for your response.

I will check the switch on Monday. The switch itself is the standard 
Dell 1855 switch, Dell PowerConnect switch.

Is anyone has other idea than the switch conf to resolve this problem?
As far as I am aware the switch config has not been changed for a long 
time, and it was well before the ES5 upgrade.
Obviously I do not neglect this possible problem source.

Kind regards,
 Istvan

> On Sat, Apr 5, 2008 at 2:43 AM, Tétényi István <tetenyi at sztaki.hu> wrote:
>   
>> Hi,
>>
>>  We have recently upgraded from  RedHat ES4 to ES5 on a Dell Blade 1855.
>>
>>  In our configuration we use bonding mode = 1 on the gigabit ethernet
>>  interfaces internally, between the individual blades and the internal
>>  blade switches.
>>  Our intention is to have an active backup configuration.
>>
>>  However, there were some errors.
>>
>>  The most characteristic was that the number of connections that are in
>>  close_wait state has  increased significantly.
>>
>>  After some sniffing, it turned out that there are dual TCP ACK-s
>>  arriving from the bonded ethernet interface.
>>
>>  I wonder, if anyone has met this problem or has some advice how to remedy it
>>
>>     
>
> It's probably your switch. Some switches require special configuration
> to handle bonded NICs. You need to create a 'trunk' or 'group' of the
> ports connected to your bonded NICs. Just be careful not to forget and
> move the patch cables around on the switch.
>
>   


-- 

Pista

=====================================================================
 Istvan Tetenyi                              e-mail:tetenyi at sztaki.hu
 Computer and Automation Institute               phone: +361-279-6022
 Budapest, Victor Hugo u 18-22                   fax:   +361-279-6021
 H-1132. Hungary
=====================================================================

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