Hello, > def run(self): > # -w 1 option to ping makes it timeout after 1 second > pingcmd="/bin/ping -c 2 -q -i 0.3 -w 1 %s >/dev/null" % ip Not sure, but "ip" should be "self.ip", this might cause the problem. HTH, -- Miki <miki.tebeka at gmail.com> http://pythonwise.blogspot.com