Re: PIX 515 responding to ARP commands...
- From: roberson@xxxxxxxxxxxxxxxxxx (Walter Roberson)
- Date: Wed, 31 Aug 2005 14:36:35 +0000 (UTC)
In article <4315a965$0$38039$bed64819@xxxxxxxxxxxxxxxxx>,
Chris Kranz <chris@xxxxxxxxx> wrote:
:I have a strange thing on my network...
:Setup is 5x 3com SuperStack Switches, 3x HP DL 380's, 1x NetApp Filer
:routed through to 1x PIX 515e.
:So my problem is that occasionally I lose a device off the network. It
:won't completely drop from the network, but my machine will lose any
:kind of connection to it.
:The confusing thing is that when the machine 'disappears', the PIX
:replies to the ARP request!!!
I knew I recognized this... this is the "Losing connection"
thread from comp.dcom.lans.ethernet .
http://groups.google.ca/group/comp.dcom.lans.ethernet/browse_thread/thread/2b8eeeb4d24af714/13ef978ec8317bcc
I see you took my advice there and snooped and saw the ARPs that
I hypothesized then.
You didn't happen to mention then, and didn't mention now, which
PIX software version you are running.
When you see the ARP reply coming from the PIX, does it have
the PIX's MAC -and- IP ?
The 3Com Superstacks: as I recall those are usually layer 2 switches,
but there was [I seem to recall] layer 3 extensions available for them.
You have 5 of them for a network that you imply contains only 3 hosts,
so are they running routing, or are they connected in an unusual
topology, or are they running a redundancy protocol or the like?
Are you running any kind of routing protocol in-house? Is
your PIX emitting a default route towards the inside, which is
normally overridden by something with a better route but that
something drops the ball?
The machines that you lose connection with, are they are the same
subnet as "your machine" ?
Is this happening -only- to "your" machine, or to several machines
in your network? What OS is "your" machine running? (Is it one
of the Proliants?)
--
Entropy is the logarithm of probability -- Boltzmann
.
- References:
- PIX 515 responding to ARP commands...
- From: Chris Kranz
- PIX 515 responding to ARP commands...
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