Dlink dwlg520 netgear WG311

[mikecasa at katamail.com]

Hi,
 
I have a little problem!

I have to configure my dlink dwl g520 and netgear WG311 card for Freebsd in ad hoc mode, but it doesn't.
 
I have installed Freebsd 5.2 on two machines.
On the first i have typed :
 
ifconfig ath0 inet 192.168.1.1 netmask 0xffffff0 ssid my_net mode 11b mediaopt adhoc.
 
On the second i have typed :
 
ifconfig ath0 inet 192.168.1.2  netmask 0xffffff0 ssid my_net mode 11b mediaopt adhoc.
 
When the machine  try to ping each other, I see arp request message and arp reply message, but machines don't ping each other.
 
Can you help me?
 
Mikele.