Have you enabled routing globally on the switch?   console(config)# ip routing   Are you able to ping the firewall from the switch?   Then you want to view the routing table. To view the route paths. Here is an example of what you are wanting to see.  On the firewall you would also want to check and configure routes to the subnets you have set up on the VLANs.   Console# show ip route  [IMAGE]      console(config)#ip route 0.0.0.0 0.0.0.0 10.0.20.x   Would be the command to tell all unknown traffic to exit to the firewall.  The x would be the ip of the firewall in VLAN 20.      
I have a simple design that I need help with for a switch that I just installed.  PowerConnect 6224 I need to define 3 VLANs (One for Customer 1, One for Customer 2 and One for the route to the Firewall(Default Gateway)) I worked at it and I'm just not up to speed on this.  i know it's simple and I took the configuration guide and used examples from that that.  This is the only use for this switch and there is no configuration on it. Any help would be appreciated.  Thanks in advance.  (Sorry for the rough idea drawing)  Didn't have Visio loaded up. [IMAGE]
Please Help! - Simple but I'm a noob