Sounds as if a packet analyzer such as EtherPeek would come in handy. Test
the PC running the application in both locations (offending room and switch
room). Compare traffic. This should narrow down what is happening. The fun
will be figuring out why.
> -----Original Message-----
> From: John Neiberger [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, August 10, 2000 2:56 PM
> To: [EMAIL PROTECTED]
> Subject: Ethernet Troubleshooting Woes
>
>
> Okay, I'm going completely out of my mind. I am at the end
> of my rope with
> this problem and I have no idea where to go from here. Basically, I'm
> begging for suggestions!
>
> Several PCs at one of our branches are having difficulty
> running a certain
> application, which uses IPX on 802.3 frames. We are also
> running IP on this
> LAN with arpa frames. There is a file server and printer on
> this LAN, and
> all IPX traffic is between the hosts and that file server.
>
> We are have ZERO problems with IP traffic on this LAN. I've
> been pinging
> the tar out the hosts and they act perfectly normal, except
> for the file
> server which had, at worst, a 98% success rate over time.
>
> On our ethernet switch, we are seeing alignment errors and
> CRC errors coming
> from the file server. The cable has been replaced and we
> verified that it
> is cat 5, but the problems still exist. This is a new file
> server with a
> new NIC.
>
> Okay, the problem is that this particular application takes
> forever to run
> from a desktop out in the building. yet, if you bring that
> very PC back to
> the room where the switch is, the application runs very
> quickly. This led
> us to believe that the cabling was bad. However, if the
> cabling were bad,
> why are we having no problems with IP traffic? None at all!
> That just
> doesn't make any sense to me.
>
> Granted, the cabling out to the desks is Cat 3 and this
> branch has had some
> previous EMI problems in the room, but I just don't see how EMI could
> selectively cause one application to fail without there being some
> indication of problems with other applications.
>
> I've considered replacing the switch, but the problem only
> happens when a PC
> out in the main room uses the application, no matter what port it is
> connected to. Bring a PC back to the switch room and connect
> it to any port
> and the program runs as advertised. So, I'm not going to
> waste my time with
> that. I've also considered replacing the NIC in the server
> since we're
> seeing errors coming from it, but that would not explain the
> problems we're
> having, anyway, so that is probably pointless.
>
> any ideas? Our next step is to hire a very expensive data
> center design
> company to go up there and check things out. We've had
> electricians check
> the room and they said they could find no obvious sources of EMI, even
> though we know that it is prevalent there.
>
> Help...please help....I'm dying here, and I'm quickly losing
> faith in my
> troubleshooting skills!
>
> TIA,
> John
>
>
>
>
>
> _______________________________________________________
> Say Bye to Slow Internet!
> http://www.home.com/xinbox/signup.html
>
> ___________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
