Another possible solution is to use private VLANs.  Below is a link to a guide on Private VLANs which covers the N-Series, later versions of Dell switches. Though the 3524 commands are not covered, the paper does state that private VLANs are supported in the 3000 series (see note on page 5).  The commands used will probably be slightly different so you will need to use the 3524 User Guide or CLI Guide to find the exact commands for setting it up.  en.community.dell.com/.../20438600 -B
I've got 15 computers plugged into my switch all using the same internet connection, also plugged into the switch.  The cable modem provides the DHCP addresses for the 15 computers.  I'd like to segregate the computers so they cannot talk to each other, but can still get to the internet.  It seems like I should be able to do this with VLANs, but I'm pretty new to managed switches and I'm having trouble figuring out the configuration.  I've got a PowerConnect 3524.  Thanks.
segregate computers from each other