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Network Engineer at a tech company with 10,001+ employees
It is free to download and install, and it runs on multiple platforms
Big trace files (more than 1,000,000 packets) can be slow, but then you can use "TraceWrangler" (also free) to help with slicing and dicing the data. This is no complaint, but is not an easy program. You will need to study to use it to its full capabilities (follow a course), but the more you know about it, the more you will use it.
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