I have runned from ideas. When I try to scan machine that use Edimax usb wlan card I get:

Starting Nmap 5.35DC1 ( http://nmap.org ) at 2011-01-31 20:08 CET
Nmap scan report for
Host is up (0.0017s latency).
All 1000 scanned ports on are filtered
MAC Address: 00:1F:1F:69:X:X (Edimax Technology Co.)
Nmap done: 1 IP address (1 host up) scanned in 21.68 seconds

I can't arp poison/spoof using linux / windows. When I'm trying I don't see any packets!. I didn't forget about:
echo 1 > /proc/sys/net/ipv4/ip_forward

and other commands.

When I'm trying to poison 'victim' is 'getting disconnected', nothing more.

Please tell me what I do wrong. All the techniques works fine against other machines.

Thanks in advance

//Victim is my 2nd notebook (was VM, now local WinXP installed) + firewall