Talk about putting your money where your mouth is!
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Whilst wireshark can be used for local packet capture, there are more robust tools out there to capture data streams.
Wireshark is usually used for the analysis of files, The filters can get pretty gnarly when you're zoning in on something (30+ terms are not unusual)
That's more than most people :)
I once worked for a firm who performed in-depth packet analysis on 10 gig links, it requires dedicated hardware with large SSD's and multiple 10Gig interfaces, and we'd place them is at least three different places in the network.
Sometimes a problem comes down to one particular process being slightly out of sequence with the rest and can cause an application to get it's knickers in a twist.
I've also seen a lot of weird shit going on on a network link that I wouldn't have thought possible, especially when links start to get saturated.