Just seeking the way to prevent arp spoof

[mUFy]

ok i am new to bsd and pfsence actually i am  a new computer user!!

i have a computer with pfsense 1.2 installed on it i have configured lan and wan and the sub mask ets…

i have the other two computers connected
ok

the first computer runs a netcut

f__ked program and when i try to disconnet the other its disconnected and i have tried to disconnect the pfsense server
and it's also disconnected
the proplem is so annoying to me and i am lookinhg for a solution to prevent client and server disconnection.....and i am asking for the option incloded in pf sense to do that......

i am sorry for that strange way i talk
and thank u if u show me how??!