
   BACKUP ALTERNATIVE
  ====================

  
  (stop-if-error
  
   ;; do we ping the gateway ?
   (=> silence ping :host gateway)
  
   ;; we ping the gateway !
   ;; but can we ping outside of it ?
   (escalation
    (=> silence ping :host "1.2.3.4")
    ;; in case 1.2.3.4 doesn't respond, try another one
    (=> silence ping :host "4.5.6.7")
    ;; we try a third host to be really sure
    (=> SMS ping :host "4.4.4.4"))
  
   ;; we can assume we are connected to the internet
   ;; otherwise it would have quitted
  
   (=> mail gopher :host "bitreich.org"))
  
