airbase-ng on intel 3945 - unable to ping

[mistm]

Hello everybody,

I've spent last 4 hours by searching this forum and googling without any success.

I have Thinkpad X61 with intel 3945 and updated backtrack 4 final. My goal is to make softap using airbase-ng. I went through lot of tutorials how to make fake ap so here are my steps:

1) setup mon0

# airmon-ng start wlan0

2) setup softap

# airbase-ng -e My_ssid mon0

3) now I see broadcasting SSID of my AP and the interface at0 is created ..... so i bring it up

# ifconfig at0 up

4) set ip:

# ifconfig at0 inet 10.0.0.1 netmask 255.255.255.0

I connect with my phone to that AP and I set up its ip to 10.0.0.2.

So now I should be able to ping 10.0.0.1 from my phone but I dont. Of course there are no firewalls and iptables are flushed.

It looks like TCP/IP protocol doesnt work but for example BOOTP (which DHCP uses to communicate before it gives ip) is working because I can see that DHCP traffic:

root@bt:~# dhcpd3 -d -cf dhcpd.conf at0
Internet Systems Consortium DHCP Server V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Wrote 0 leases to leases file.
Listening on LPF/at0/00:1c:bf:04:a8:8f/10.0.0/24
Sending on   LPF/at0/00:1c:bf:04:a8:8f/10.0.0/24
Sending on   Socket/fallback/fallback-net
DHCPDISCOVER from 00:23:76:1d:f9:44 via at0
DHCPOFFER on 10.0.0.100 to 00:23:76:1d:f9:44 (HTC49) via at0
DHCPDISCOVER from 00:23:76:1d:f9:44 (HTC49) via at0
DHCPOFFER on 10.0.0.100 to 00:23:76:1d:f9:44 (HTC49) via at0
DHCPDISCOVER from 00:23:76:1d:f9:44 (HTC49) via at0
DHCPOFFER on 10.0.0.100 to 00:23:76:1d:f9:44 (HTC49) via at0
DHCPDISCOVER from 00:23:76:1d:f9:44 (HTC49) via at0
DHCPOFFER on 10.0.0.100 to 00:23:76:1d:f9:44 (HTC49) via at0

I am greatly thankful for any suggestion!

Is it possible that the problem is that I am trying to connect with Windows mobile? Maybe normal laptop would work? What do you think?

none knows? :-/

I tried to connect with another laptop (Windows 7) and the situation is same. I attach tcpdump output when I am trying to connect. Obviously there IS some traffic - mostly UDP.

Any suggestion is welcome.... if you know how send some trafic which would test out how it behaves tell me please. I went out of ideas. Thanks.

[mistm]

Yesterday I've tried BT 4 R1 dev release. When i started airbase-ng the AP appeard on the client's AP list but it was impossible to associate. On airbase-ng I didnt see any clue about connecting. Even though intel 3945 is comfirmed to work out of box, mine 3945 doesnt work in R1 or even FINAL release.

That could means that the problem lies somewhere else - firmware of wireless card/some bios settings? Bios firmware? I have no idea.

Any suggestions?

[mistm]

I've just tried the same method on another wireless card and it worked well ... so I guess its problem of 3945 mini pci express card. I also found few more people who are having this.

Conclusion: if you experience the same thing as I did I suggest you to get another wireless card.