Re: Odd Networking problem.

On Wed, 22 Jun 2011, Al Hopper wrote:

|->On Tue, Jun 21, 2011 at 6:14 PM, Keith <[email protected]> wrote:
|->>
|->> On Tue, 21 Jun 2011, Dan Gullick wrote:
|->>
|->> |->I have known this issue to happen with certain hardware vendors (Nortel) where the ARP table is not accurate.
|->> |->Out of curiosity, can you list the network equipment in the middle?
|->>
|->> It is just an IBM server directly connected to a 24 port Cisco 3560 with
|->> multiple Vlans.
|->>
|->> The 3560 has a connection to a 7206 and two other 3560's.
|->
|->Lessons learned:  Modern motherboards are so complex, with so much
|->functionality embedded within complex
|->LSI (large scale integration) devices, that the possible failure modes
|->are *impossible* to define.
|->And probably, impossible to test for, in terms of an
|->end-of-the-production-line test.
|->

This machine after about 2 months of being in production and acutally
being used to serve mail traffic, failed. But it was the CPU that failed.

We replaced a bunch of things, MB, RAM etc, still would not come up.
Finally the IBM guys said lets try a new CPU. Did that and the machine
came up and worked fine until last Friday when this network thing came up.

It has two NIC's, one to a private network one to public.

I finally rebooted it this morning. Wierd thing was after it was back, I
have 4 servers sitting in another Vlan on another switch. 3 of the servers
could reach the flaky machine. But the machine that monitors sevices could
not. The only thing different is monitor machine has an old PIX in front
of it.

Thanks.
Keith
-- 
Eat sushi frequently. - Avi
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