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.

I wonder if the pix is seeing ARP activity it distrusts...anything in the
logs?  Also, does the monitor machine show the flaky one in its ARP table?

-- 
Eat sushi frequently. - Avi
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