strange eth behavior

[vu Pham]

On 12/18/2012 9:17 AM, Lonni J Friedman wrote:
> On Tue, Dec 18, 2012 at 5:18 AM, vu Pham <vu at sivell.com> wrote:
>> Just a strange experience that I would like to share to everybody.
>>
>> This server has two Broadcom nics. Both are working fine until last
>> night when the server log reported a CPU Check. It rebooted normally.
>> One nic works properly. The other one has this strange behavior and I
>> did turn off all the firewalls on this server.
>>
>> - it can ping to any other servers ( in the same LAN or not )
>> - nobody on the same LAN can ping it. tcpdump shows it does issue the
>> icmp replies, but the other servers do not see them.
>> - on its LAN, it can ssh only to the router , and cannot ssh to any
>> other servers. tcpdump show the packets sync, syn-ack and then reset
>> immediately after the syn-ack.
>> - it can ssh to others servers behind the routers
>>
>> This morning I added another nic into the server, migrated all the ifcfg
>> settings to the new one and all work fine now.
>>
>> Called Dell and they are going to send me another motherboard.
> This sounds like the classic symptoms of having the wrong netmask.
> Are you 100% certain that the replacement NIC has the exact same
> settings as the 'bad' one?
>
>
Yes. I just double-checked it.