Adding static route fails

hi every1,

i would like to add a static route to my pfsense 2.1

i get the error:

The following input errors were detected:

    This network conflicts with address configured on interface vlan 350.

i am using vlans on a layer3-switch. i assigned an ip-adress to the vlan350, which is on my lan-network (connected on the layer3-switch), since i want to use a dhcp-server for that vlan.
now i would need to set the layer3-switch as gateway for that specific destination (172.16.50.0/24)

diag_routes says:

Destination 	Gateway 	Flags 	Refs 	Use 	Mtu 	Netif 	Expire
172.16.50.0/24 	link#17 	U 	0 	0 	1500 	em3_vlan350 	 
172.16.50.1 	link#17 	UHS 	0 	0 	16384 	lo0

how can i achieve this?
is any1 else working with vlans and dhcp?
after turning off dhcp and turning off the static ip on the vlan350. i could add the static route without any problems. but i need dhcp!!
thanks for any help i could get.

jimp

You cannot do both. You either have direct access to the subnet, or you can route it. If you must have DHCP, then have those clients use the firewall for their gateway and not the switch. Otherwise you will need to serve DHCP from a difference device and not pfSense.

thx for your reply