Recently I created a presentation for a client on SSL. The purpose was to give a packet level view of the SSL protocol so the client and their support team would have a better understanding of the problems they had. The original presentation was done in powerpoint so I adapted it to blog format.
Brief SSL History
SSL v1 was developed by Netscape back in 1994. It was developed with the main purpose of security web browser traffic to the server. Now the SSL protocol is used for many different system to system communications. Continue reading
To effectively troubleshoot network traffic you must extract from the trace files key information points. To extract and view this information you must customize your protocol analyzer to present this custom view of the information. One of the most widely used protocol analyzers is the free tool called WireShark and by default this tool provides a very limited view into your trace files. Since this is the tool I personally use I will show you how I’ve customized it to provide the data I need.
A few weeks ago, during a technical group meeting I hold here in town, a question came up that is now the basis of our next meeting. Does every TCP segment get an ACK returned?
My unqualified answer to this question was “No” as I had troubleshot some connections before and noticed that not every TCP segment received was sent an ACK. When challenged on this I couldn’t give the technical background for this just that this was my experience. Of course others in the group had different experiences so the only way to solve this was to do the research. Continue reading