Tried to use the native drivers, but no joy, so reverted to ndiswrapper to get wireless on Dell Inspiron 530 with Centos 5,2. The Belkin F5D7050 usb wireless interface had been working ok on an old noname machine running Knoppix (I'm trying to upgrade this to the Dell).

Downloaded and installed ndiswrapper (tried 1.53 from Sourceforge and 1.54 from dl.atrpms.net)
Installed blkwgu drivers from Belkin (WinXP)
ndiswrapper -i blkwgu.inf
ndiswrapper -m
Added "alias wlan0 ndiswrapper" to /etc/modprobe.conf
created file ifcfg-wlan0
modprobe ndiswrapper
service network restart

It gets an IP address
iwconfig works ok

Disable the eth0, reboot the machine/restart the network - it gets an IP address - but when I ping the gateway (192.168.2.1) I get an extra 4 DUP returns.

With wireless only I can connect to the router using firefox - and to another internal website (webcam), but I can't connect to the internet. All other Win machines are ok on the network and have internet access. If ethernet cable plugged in and eth0 active then I can ping both the cable and wireless from other machines and use ssh and ftp via the wireless.

iwlist wlan0 scan gives me a list of available networks with wireless only working.

I had to remove kd1211rw.ko because this was causing address conflicts with the wireless card.

Here's what I get when I ping the router (wireless only)
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=77.7 ms
64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=97.4 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=158 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=65.0 ms
64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=65.7 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=67.5 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=68.2 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=119 ms
64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=126 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=153 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=39.9 ms
64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=40.5 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=41.1 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=55.2 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=59.3 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=102 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=27.9 ms
64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=28.2 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=28.7 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=29.7 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=6 ttl=64 time=82.3 ms
64 bytes from 192.168.2.1: icmp_seq=6 ttl=64 time=83.8 ms (DUP!)
64 bytes from 192.168.2.1: icmp_seq=6 ttl=64 time=85.4 ms (DUP!)

Here's the ifcfg-wlan0
# NDIS Wrapper Configuration: Belkin FD7050
DEVICE=wlan0
ONBOOT=yes
BOOTPROTO=dhcp
TYPE=Wireless
ESSID=MyNetwork
PEERDNS=yes
USERCTL=yes
CHANNEL=11
HOSTNAME=DellInspiron
RATE=Auto
IPV6INIT=no
MODE=Auto
DOMAIN=
DHCP_HOSTNAME=
HWADDR=
IPADDR=
NETMASK=

I've tried it with static and dhcp - same effects

WEP security (it's good enough) gets picked up - the machine appears in the DHCP list on the router

modprobe.conf
alias eth0 e1000e
alias scsi_hostadapter ahci
alias snd-card-0 snd-hda-intel
options snd-card-0 index=0
options snd-hda-intel index=0
remove snd-hda-intel { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ; }; /sbin/modprobe -r --ignore-remove snd-hda-intel
options ndiswrapper if_name=wlan0
alias wlan0 ndiswrapper


I'm out of ideas apart from buying another wireless interface. Anyone got any suggestions for a fix?