wlan not working at all (lost packets)

Hi!

I installed a wlan nic (rt2500, 802.11g) in my computer (Suse 9.2
Kernel 2.6.x) and set it up as ra0.
At least I get a connection to my Access Point (WRT54G with
Alchemy-pre5.4a v2.04.4.8sv). A dynamic IP (192.168.0.103/24) is
deployed and I can access the Internet. Encryption is set to WPA PSK.
When I try to communicate within my LAN there are major problems.
Another host (192.168.0.110/24) connected physically cannot be pinged.
All packets are lost.
Doing a "traceroute 192.168.0.110" no route seems to be found.
So I thought there'd be a problem with my routing table?

Here what "route" gives out:
Destination Gateway Genmask Flags Iface
192.168.0.0 * 255.255.255.0 U ra0
link-local * 255.255.0.0 U ra0
loopback * 255.0.0.0 U lo
default 192.168.0.10 0.0.0.0 UG ra0
seems to be okay for me!

When I try to ping the other way (eth0 192.168.0.110 -> 192.168.0.103
ra0) there are also packets lost, but only about 50%.

Any hints?
Thanks.

Hello Jochen,
Why you don't run tcpdump in both hosts and see what can you find. I
don't see anything in the routing table either.
Regards,
andres