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Why not just create a GraphML, GDF or GEXF file and load it into Gephi[1]?

Seems way simpler and that program has all kinds of algorithms that lets you visualize graphs. If you want to show the graph to someone else, stream it or make a webm.

I guess the only limitation is it would be tough to do it on live data.

[1] https://gephi.org/

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You could do interactive view options / drill down with this that needs on the fly reanalysis of the traffic. Doing it all beforehand and generating all possible graph data "just in case" gets too expensive fast.

A simple example would be showing desired protocol level details via the Wireshark XML output stuff.

You can do all those things in Gephi. Just give each node/edge those attributes and you can filter/query by them.

You can very much show desired protocol level details - just convert Wireshark XML to one of the common graph formats and load that.

So how to address the graph size problem?

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