[CentOS] Server packet loss and becomes unresponsive

mark m.roth at 5-cent.us
Wed Nov 4 01:05:04 UTC 2009

Timothy wrote:
>> did you mention if any recent OS or other software updates like 5.3 to 5.4
> or otherwise?
> It is a newer box w/ 5.4 installed.
>> someone could be DOS'ing the server ???
> Does not appear that way and if it was I would imagine console should still
> work but it does not.
>> do you run a firewall and drop bad traffic to the floor or is it wide open?
> I do run a firewall and drop traffic.
>> what about thermal issues?
> Temp does not spike during these periods.
>> recent BIOS update?
> No
>> also, you might consider using some boot time kernel parameters to disable
> things hardware wise etc that are not absolutely necessary.
> I have disabled acpi in kernel.  Anything else I should disable?
>> does it match the switchport? i.e. hard set? auto negot? cisco should be
> hard set.
> Yes it matches but direct console crashes so I do not feel it is a network
> issue. If it was I would imagine you should still be able to direct console
> in.

Do you have smartmontools installed and running? I just was reading about that, 
and it can *cause* lockups and crashes. Check the WARNING file in the distro.

Right, breathing is addictive, as shown by the withdrawal
symptoms. - Steve Gruenwald

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