Qtek 9000 / Mobile 5 network problem

This message concerns the fact that I can connect to my wireless network
using my Qtek 9000 PDA, but I never get an IP adress. Any help would be
welcome!

I recently got a Qtek 9000 (running Windows Mobile 5.0), and am trying to
connect to my home wireless LAN.
Using a US Robotics USR5450 wireless acess point and MAC filtering, I get a
network connection pronto. However, I never get a valid IP address from my
DHCP server.
(All is functioning very well when I use my tablet PC to make the same
connection. )

All adapters as seen in the Settings/Configure Network Adapters are set to
'use server assigned IP address'.
Looking at the 'tiacxwln Compatible Wireless Ethernet' adapter I see that
the PDA has received an IP address, though not one I recognise as valid
(IPv6?): [fe80::209:2dff:fe52] After a while, this disappears. Sometimes,
the same field is briefly displaying the internal default [169.252.49.103],
then reverting to the previous one.

I tried hard-setting the WAP to B-mode; no change in results.

Looking at what's happening near the server I see:
-----------------------------------------------------------------------------------------------------
tcpdump (http://www.tcpdump.org/) output on linux DHCP server (MAC address
obfuscated):

tcpdump -i eth1 -vv -x ether host 00:09:2D:XX:XX:XX
tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 96
bytes
14:17:22.882777 IP0 bad-hlen 0
0x0000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............
-----------------------------------------------------------------------------------------------------

I tried excluding the Linux DHCP server from the picture. I connected the
WAP directly to a Windows PC, using Windows internet connection sharing on
Windows XP (SP2). No packets seen with ethereal
(http://www.ethereal.com/). (Perhaps the bad packets are dropped by windows
kernel?)

So, it appears that for some reason Mobile 5.0 has some difficulty
communicating with the DHCP server.
Any ideas, any deeper insight?

-Ruud


.

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