Device patm on FreeBSD 9.2

[Jack Mc Lauren]

I've recently configured my kernel with the following options          
    device        patm     device        utopia 
    device        atm 
    options       NATM 
    options       LIBMBPOOL 
In order to use patm device on my FreeBSD 9.2 AMD64.Here are the configurations for a back to back connection 
    ifconfig patm0 10.10.10.1 255.0.0.0 
    atmconfig natam add 10.10.10.2 0 100 aal5 
 
after setting these configurations, I can not even ping the other side!
Please help me using this device on my system. 
Thanks in advance ...