IP/Netmask, but no connection...

I can't get my wireless to work. I am using SuSE 9.0 with a Proxim
Orinoco, with the ath_pci driver.

It worked before, but now I can't get working!

I restarted pcmcia and wlan0, and it gives me an IP/Netmask! So, it
should be fine!

But if I ping to another IP address, it says:
> connect: Network is unreachable

Can anyone help? What can I do?

This is my /etc/sysconfig/network/ifcfg-wlan0

BOOTPROTO='dhcp'
MTU=''
REMOTE_IPADDR=''
STARTMODE='onboot'
UNIQUE=''
WIRELESS_ESSID='linksys'
WIRELESS_KEY=''
WIRELESS_MODE='Managed'
WIRELESS_NICK=''
WIRELESS_NWID=''

iwlist wlan0 scan shows several networks, among them my-essid, which I
seem to be connected to:

# iwconfig wlan0
wlan0 IEEE 802.11-DS ESSID:"my-essid" Nickname:"my-hostname"
Mode:Managed Frequency:2.437GHz Access Point:
xx:xx:xx:xx:xx:xx
Bit Rate=11Mb/s Tx-Powerff Sensitivity=0/3
Retryff RTS thrff Fragment thrff
Encryption keyff
Power Managementff
Link Quality:0/92 Signal level:50/154 Noise level:0/154
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0