Many of my clients or I can not share trace files because sensitive public ip addresses, port numbers or data is easliy seen within the trace. Unfortunately many vendors would benefit from the trace to address a performance or bug within their product.
In the end I typically resort to blurred screen captures, a lot of writing and more phone conversations to convey what I am trying to explain. Because of this extra effort, I must admit that as a general rule, I shy away from offering trace files.
Stuart, one of my readers passed on this little gem called, "tracewrangler" that can 'sanitize' or change your trace files.
I've used it a few times this week and found it quite good.
TraceWrangler is a portable app in the sense that there is no installation required and whips through a 1MB file in a blink of an eye. note that this utlity only supports Wireshark's new pcapng format.
Hope you like it.