i couldnt access from Lan clients to internet

[vahedifar]

Hi Guys
I have just installed pfsense 2.4 ,i can access to internet from both lan and wan internet through the pfsense but my lan clients can not access.i have a cisco 3850 switch that acts as a vtp domain server .i have wrote default route in 3850
ip route 0.0.0.0 0.0.0.0 pfesense ip
all the firewalls rules and Nat is ok
thanks