Re: Randomly loosing connection...

Have you considered a static route definition to see if it affects your
issue? You have a theory and you now just need to test it and continue
troubleshooting.

3com. You may want to verify that you're not having a problem with
auto-negotiate. You can test that by ensuring that your network cards and
ports are not set to auto-negotiate but instead are set to their optimal
settings.

What type of nics are these? GigE?


"Chris Kranz" <chris@xxxxxxxxx> wrote in message
news:430d86db$0$38037$bed64819@xxxxxxxxxxxxxxxxxxxx
> I'm not 100% sure whether this is an Exchange issue, or something on our
> network, but either way it is very strange...
>
> I have a 3com powered network, 4x 4200's, and a 4400 which is the central
> one. I've disabled Broadcast Storm Control (which I thought might be a
> problem) and the Multicast Filter on all these.
>
> My problem is, I run a constant ping (as I'm trying to debug this problem)
> from my machine to 3 of our servers, the Exchange server, the DC and SQL
> server and a NetApp Filer. The trouble is, I'll lose approximately 5-10%
> of these pings over the course of the day, for no particular reason. One
> of the machines, usually the Exchange or Filer, will just drop all pings
> from my machine. However it won't have dropped pings from all machines. I
> run the same ping from the DC and it'll run fine during my outage,
> although it itself will have problems when I don't.
>
> Quite an aggravating problem, as I have no idea how to trouble shoot this.
> The NIC's on all servers are fine, the Exchange box is an identical
> hardware build to the DC. The only errors I get in the Event Logs are that
> Exchange losses connectivity to the DC and GC occasionally.
>
> The bizarre thing is when I look at the ARP tables on my machine. During
> the ping outage, which usually last about 5 minutes, if i bring up the ARP
> tables, the IP of the failing machine is identical to the IP of the
> gateway box (PIX 515e). If I clear the ARP cache, it will immediately
> regain connection to the failing machine.
>
> What I _think_ is happening, is that 1 ping is getting dropped, or
> failing, and so the client machine asks the gateway what route to take.
> Somewhere the client machine decides that the route to the host machine is
> through the gateway, which is where it fails. But again, I don't know how
> to trouble shoot or start to fix this problem. Our office is too small to
> even start thinking about VLAN's (4 servers, 50 users). However I need to
> get this fixed as I need to launch the Exchange server into production in
> the next few weeks.
>
> Any help please?
>
> Chris K


.

Relevant Pages

  • Randomly loosing connection...
    ... My problem is, I run a constant ping from my machine to 3 of our servers, the Exchange server, the DC and SQL server and a NetApp Filer. ... During the ping outage, which usually last about 5 minutes, if i bring up the ARP tables, the IP of the failing machine is identical to the IP of the gateway box. ...
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  • Losing connection...
    ... My problem is, I run a constant ping from my machine to 3 of our servers, the Exchange server, the DC and SQL server and a NetApp Filer. ... During the ping outage, which usually last about 5 minutes, if i bring up the ARP tables, the IP of the failing machine is identical to the IP of the gateway box. ...
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