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TCP / IP Roblems OS 9 - Mac Applications & Software

I am primarily a PC guy but I do support a Mac network as well. I am working on a Windows 2000 domain with about 1000 PC's and about 15 Macs. Last Tuesday inexplicably users of OS 9 systems could not longer access anything dependent on TCP/IP, we could however ping the machine while tcp/ip seemed to be dead and by switching to boot P or static addressing we could get the machine up and running for about 15 minutes to a couple of hours before we encountered the same problem again. Interestingly enough rebooting the PC did not correct ...

  1. #1

    Default TCP / IP Roblems OS 9

    I am primarily a PC guy but I do support a Mac network as well. I am
    working on a Windows 2000 domain with about 1000 PC's and about 15
    Macs. Last Tuesday inexplicably users of OS 9 systems could not longer
    access anything dependent on TCP/IP, we could however ping the machine
    while tcp/ip seemed to be dead and by switching to boot P or static
    addressing we could get the machine up and running for about 15
    minutes to a couple of hours before we encountered the same problem
    again. Interestingly enough rebooting the PC did not correct the
    problem. Appletalk which we use to print however stays alive all the
    time, even when tcp/ip is dead. The macs are running running a mixture
    of OS 9.1, 9.2, and OS X. Users of OS X never experience the problem,
    except for when in classic mode (OS 9 inside OS X) They are forced to
    use this for Outlook 2001 and the version of Quark they are running.
    We have brought in a Mac specialist from the area and I worked with
    him for the better part of the day on Friday and for some reason the
    problem was not occuring for the time that he was there, about 4
    hours. Network traffic was lower than usual Friday because of a
    function going on that took many users away from their boxes. We are
    really scratching our head, he spoke to Mac engineers who indicated
    they have never encountered the problem. I did happen to find some
    similar posts on the newsgroup but never a resolution or cause? Our
    hypothesis is that the stack is becoming unstable or perhaps the
    buffer is overflowing causing the erradict behavior. What's going on
    here? If I 've left anything out I would be glad to fill you in
    further. Any help would be greatly appreciated.

    Thanks,
    Craig P.
    Craig Guest

  2. #2

    Default Re: TCP / IP Roblems OS 9

    >Last Tuesday inexplicably users of OS 9 systems could not longer 

    A couple of things come to mind:

    1. Are you using routers or managed switches which implement Spanning Tree
    Protocol? If so, you must disable it for whatever ports the Macs are connected
    to.

    2. I saw a similar problem at one of my client's recently; in addition to
    problems connecting to the network, the Macs also communicated very slowly when
    they could connect. The problem was ultimately traced to a configuration in one
    particular Cisco router which all the Macs were homed to. I never did figure
    out exactly what the problem was, but connecting the Macs to a different router
    resolved the problem completely.


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    Tacit Guest

  3. #3

    Default Re: TCP / IP Roblems OS 9

    com (Tacit) wrote in message news:<aol.com>... 
    >
    > A couple of things come to mind:
    >
    > 1. Are you using routers or managed switches which implement Spanning Tree
    > Protocol? If so, you must disable it for whatever ports the Macs are connected
    > to.
    >
    > 2. I saw a similar problem at one of my client's recently; in addition to
    > problems connecting to the network, the Macs also communicated very slowly when
    > they could connect. The problem was ultimately traced to a configuration in one
    > particular Cisco router which all the Macs were homed to. I never did figure
    > out exactly what the problem was, but connecting the Macs to a different router
    > resolved the problem completely.[/ref]

    Tacit,
    Thanks for the insight, we are an all Cisco house but I'm not 100
    percent certain on the spanning tree protocol configuration, but I'll
    be sure to ask our network engineer. One thing we did notice when
    using a utility called mac ping we were getting network errors in the
    range of 3.5 to 10 percent ping from an OS 9 machine to an OS X
    machine on the network. Pinging windows clients yeilded no errors. We
    did find there was a problem with the auto negotiation on the switch
    with this particular Mac which we went ahead and corrected. Any other
    insight you could provide or any details you need from me let me know
    I'd love to get this resolved.

    Thanks,

    Craig P.
    Craig Guest

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