So we now use the browse parameter, like thus: xtractr browse (index_directory)
So using our example above, and assuming our box has an IP address of 192.168.100.10, our browse command would be: xtractr browse index_dns --host 192.168.100.10
If we wanted to use a port other than 8080, we could add the --port parameter to bind to a port other than 8080.
Point your browser to ip_address_of_the_xtractr_box:8080 or, if you specified a different port, ip_address:(port_number)
Mu has a large repository of user supplied pcaps available to the community, to test with and experiment. They encourage you to contribute to the library, and there are some very obscure and esoteric packet captures available to you there.
You can go to the xtractr web site's live demo, at http://www.pcapr.net/xtractr/demo#/flows, and see what all this packet parsing goodness looks like, and play before you download.
(Folks at Mu.. if you come across this post and I've screwed up anything, please Twitter me @JeffSoh and I'll correct it ASAP)