oops - was concentrating only on Errors -
Various examples on the web have (very) high Unknown protocols in their examples but haven't found an explanation.
I currently have 9 Unknown on my machine and not sure why I should have any or if it matters.
Do cheap GigE hubs exist? Non-cheap?
No gigabit ethernet hubs exist except possibly for hand-made one-offs in laboratories somewhere. To get a monitoring port on gigabit you're going to have to get a managed switch. Surprisingly, there is one available at a not too terrible price, the Hawking Tech HGS16S for around $250. I have no idea how well it works, but one limitation is that it can only monitor two ports at a time. Still, as a diagnostic tool a crappy managed switch is still better than an unmanaged one.
Are the switches auto-negotiating speed and duplex? If so, are they negotiation duplex correctly. I have seen occasional problems with this between Extreme and Netgear kit.
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