Advanced TCP/IP Analysis Tools?

fwc asks: "Every once in a while I come across a problem with TCP/IP which defies analysis with your standard TCP/IP sniffers and other analysis tools. Are there any advanced tools out there which I should be adding to my arsenal? Just something which would take a tcp/ip flow and point out things like out-of-order packets, retransmissions, excessive round-trip-delays and other tcp/ip brokenness would be extremely helpful. An open source solution is of course always preferrable."

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tcpflow?

[SEWilco]

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