okay it was my mistake, the script needs to output 4 lines not the 3 I was outputing. Thanks for all the help. Robin -- * To unsubscribe from the mrtg mailing list, send a message with the subject: unsubscribe to mrtg-request at list.ee.ethz.ch * The mailing list archive is at http://www.ee.ethz.ch/~slist/mrtg