Hi everybody,
I am planning to set up an ad-hoc network between a lenovo x60 laptop
(Fedora 9, update to the newest, IPW3945 802.11ABG, the interface is wlan0 )
and the phone (kernel 2.6.24, freerunner, the wireless interface is eth0). I
hacked this problem for two days, and I observed the following anormalities.
1, X61 can see the ad hoc cell. I use iwlist wlan0 scan. The output
displays the ad-hoc network cell id (xx:xx:xx---), ssid name (xxxx), and the
same frequency, and the encryption is off. But on the other side, the phone
can not see the ad hoc cell. I use iwlist eth0 scan, the output only shows the
cell established by some access points (master mode). I am sure that the
setting at the phone is correct (ifconfig eth0 down, iwconfig eth0 mode ad-hoc,
essid xxxx, channel xxx, enc off, ifconfig eth0 up).
2, Then I ping X61 from the phone, I use wireshare (a packet sniffer
tool, like tcpdump) to sniffer the received packets at X61, I can see X61
received ARP requests from the phone and sent ARP replies back to the phone,
but the phone did not get any ARP replies. Therefore the phone continue sending
ARP request messages. What's the reason does the phone not receive packets
correctly? too noisy?, can not unencrypt packets?
3, I ping the phone from X61. I observe from tshark that ARP requests are
already sent out, but no ARP requests are received at the phone, observing by
using tcpdump -i eth0 host 192.168.100.200, which is the ip address of X61.
4, at the phone, sometimes the changes of channel (using iwconfig eth0
channel N) can not take effect, no matter how long I wait, even if I use
ifconfig eth0 up frequently. The wireless adaptor (AR6000) at the phone always
tries to stick to the original one
5, I can access an access point, and whereby access the internet.
6, I use iwconfig eth0 to list the status of the phone wireless adaptor.
The sensitivity is read 0/3, and the link quality is read sometimes 0/94, and
sometimes 100/94. What does that mean? Does that mean the sensitivity threshold
is too high, so the wireless adaptor treats signals as noise? But I tried to
set sensitivity (iwconfig eth0 sens NdBm). The output says that the wireless
card does not support this operation.
7, I check the ouput of all related commands (e.g., /etc/hosts,
/etc/resolv.conf, netstat -nr, route). pretty sure that routing is not a
problem.
Does anybody have the successful experience to setup an ad-hoc network
using openmoko phones? I am very frustrated.
Thanks very much
Jun
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