anchor.diff:  
   [source,python]
   ----
  -$cat cap2/dns_test.yaml
  +[bash]>cat cap2/dns_test.yaml
   - duration : 10.0
     generator :  
             distribution : "seq"           
  
positive.code: 
  [source,python]
  ----
  $more cap2/dns_test.yaml 
  - duration : 1.0                        <1>
    generator :  
            distribution : "seq"           
  
negative.code: Example:
  [source,bash]
  ----
  [bash]>sudo ./t-rex-64 -f cap2/imix_64.yaml  -d 1000 -m 40000  -c 4 -p
  ----
  
  [WARNING] 
  