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Is this network, Swiss Cheese?

Can someone help with this network issue?

3 managed netgear switches connected to a router along with 2 linux servers which run out dialler and dialler databases.

Then off the managed switches some directly connected machines and then maybe 3-4 smaller switches dotted about on desk pods in each room. These smaller switches are not managed.

90% of users use a workstation and sip soft phone which calls via their computer

the rest of the users have a desk sip phone using passthrough so network to phone, phone to pc.

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When the 'drop out' problem occurs pretty much all desk phone users notice their phone freezes in most cases or slows down like mad so interface takes 10-15 seconds to do anything and connection to network appears lost. At this point the phone wont do anything now unless its power cycled. Similarly the pc which gets its connection via the phone cant communicate. A reboot of both phone and pc brings it back online.

The users with software sip clients, get dropped off calls, though haven't got clear answer if this is all of them or not, however they seem to be able to carry on fairly quickly afterwards not having to reboot or anything.

Again at the moment when it has happened up till now I've only found out 3rd hand its gone down and then without any specific timeframe for me to try and trace the logs.

At the moment ive set up a constant logged ping to my managed switches and router , have my syslog server pulling everything the router is sending up, wireshark monitoring my network interface and The Dude which has some monitoring built in and lists outages if any. hoping one of these will give me some kind of idea what is going down first or when or whatever so i can trace. Driving me bonkers.

That said nothing so far has happened since about 9:45am but had it 3 times yesterday.

If you have any ideas of things to check or if you know of any good monitoring tools i could try that would be great!


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