For some reason I am unable to download your latest capture file.
I agree with your deduction, "
blah-blah@BURST.net" appears to be your login username to the bRAS.
Will you please reload that capture file into Wireshark, filter the display for "
chap" and then see how many Challenge-Response line pairs are present. Looking at the image you've displayed, there are three line pairs and only the third pairing has a following "
Success" line.
If you look a little deeper into Wireshark, you will find that there is an option to print out the capture. From there, just instruct it to print to a file. The print to a file option also has its own options . . . you should be able to find what is required to print out in a similar format to that of my (spoof) example. All being well, you will have an ASCII text file containing a header and five lines of data. That ASCII text file can then be attached to a forum post.