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Wireless Networks Thread, Network getting too large? in Technical; How many connections to cabs do you have coming into the switch?...
  1. #16
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    How many connections to cabs do you have coming into the switch?

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    We only have one Because we are a small/medium business at the moment and not heavily web based just yet.

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    A couple of other things to try -

    When experiencing issues, pull the plug on the upstairs switch - does this return the workstations downstairs to normal speed. This would narrow down issues to upstairs.
    Again when issues are happening, check you can ping the router. It may be this is rebooting (it could affect everyone, depending how DNS is setup on the server)
    Check on a workstation with problems if you can ping the server both by IP and dns. Try pinging other resources. Try accessing other shares too.

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    The switch in the cab has 48 10/100 ports, about half are taken up.

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    bodminman's Avatar
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    Disconnecting the upstairs switch when the issue is happening may help to isolate its location.

    Is there anything in the server event logs?

  6. #21

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    Nothing weird in the server event logs, except a lot of XPS print failures from my workstation under 'System' logs

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    You may find that you're switches are being overloaded with ARP traffic, which will force the switch to clear the cache giving the symptoms you've described.

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    Hi,

    How do I reduce or eliminate this ARP traffic?

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    You can't eliminate it. The ARP cache is like the 'directory' of what's connected to the switch and any other switch.

    You can reduce it by creating VLAN's or buying a higher grade switch with a larger ARP table.

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    Thanks, I'll have another stab at VLANs. Tried it yesterday but couldn't get the printers to work properly. Shared resources like printers, server and router all need to be in every group am I right in thinking?

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    I've downloaded this thing called wireshark, would it help if I posted some of the results from it from my server?

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    Wireshark will capture every packet, either sent or received from the server.

    There should be millions of packets travelling back and forth every day. To filter through them all is a long and arduous task.

    Log into the web interface of the switches and check their ARP tables. Most switches will give you statistics and LOGS of what the device has been doing. You can trend what's happening from there.

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    is an average of 4400 packets per second a lot?

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    Depends on what this server hosts and how much load is being produced.

    Work the theory the opposite direction - ping from the server to another device (router, switch or printer) and see whether it drops packets.

    Wiresharking the server won't help you with diagnosing if a switch is your issue. You need to view the logs of the device.

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    Ok, thanks for all your help! The staff will be coming in soon so hopefully the problem has passed and shit doesn't hit the fan once again :P

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