Such as WAN link utilisation.
Users were complaining that network performance was slow across the 80M WAN link. How did they know? Citrix users mostly …
So I ask our telecommunications provider, “is our link congested?”
‘No, 60% utilisation. Here’s a graph of the network performance:”
Can you see what’s wrong? Well there’s a couple of things, it’s a sample image for example. But if you knew we were running Netware 3 & 4, you’d expect to see IPX/SPX traffic. Which were the protocol layers our users were mostly using.
“Where is it?”, I ask.
‘Oh, we don’t measure IPX/SPX traffic, it’s only IP.’
My estimate, based on running a network sniffer, was that IPX/SPX was using 30% of the WAN link.
My recommendations were:
- remove IPX/SPX
(difficult, talking Netware 3 & 4 here)
- upgrading the WAN link.
“Reports that say that something hasn’t happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns — the ones we don’t know we don’t know.” – Donald Rumsfeld