Hello Pete,<br><br>Your long shot is in the bulls eye!!! The equipment involved in this case is:<br>an Cisco cat 4003 Cisco cat 4920 switch alle gigabit ethernet interfaces. <br>We will discuss this issues with Cisco of course. Network should not be dependant on $AA!!!<br><br>So as you say at the end of your message, this differance between PingPlotter and ping helps us debugging some problems in our network (www.surfnet.nl)<br><br>All the best,<br><br><br>Victor<br><br>