I have several clients connecting to a 2950 switch that can not reach the dhcp server. The 2950's connect to the 4506 core switch via dual fiber. The 4506 handles intervlan routing and has the ip helper address defined in it. There are possibly 10 clients out of 150 that can not hit the dhcp server. The have portfast enabled and are hard coded to 100/full. Please let me know if you have any ideas.