The roadwarrior <b>carol</b>, possessing a certificate issued by the
Research CA, tries to set up a tunnel to gateway <b>moon</b>.
The Research CA's certificate is signed by the Sales CA and
the Sales CA's certificate in turn is signed by the Research CA.
This leads to an endless trust path loop but which is aborted by
<b>moon</b> when the path level reaches a depth of 7 iterations.