strange eth behavior

[Lonni J Friedman]

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?



-- 
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L. Friedman                                    netllama at gmail.com
LlamaLand                       https://netllama.linux-sxs.org