The Intel project is at: http://ipw2100.sourceforge.net/
I Got it to work by upgrading my Fedora core 1 kernel and RPMS from:
http://atrpms.net/name/ipw2100/
http://atrpms.net/dist/common/ipw2100-firmware/
http://atrpms.net/name/hostap-driver/
I had WIFI working with a Wavelan pcmcia card before, but I wanted to use the Sony Vaio PCG-Z1RSP
own wireless options with my (old) Apple Airport base station. I did not get WEP to work because of
the arc4 crypto giving trouble, but I have a MAC-address access control.
My Current setup also works with the Sony IClie TH55, Lucent Wavelan and Apple (Original) Airport card) and
under Windows 2000 with the same Vaio.
This is the list of RPMS required:
atrpms-56-1.rhfc1.at.i386.rpm
hostap-driver-0.1.3-4.rhfc1.at.i386.rpm
ipw2100-0.51-14.rhfc1.at.i386.rpm
ipw2100-firmware-1.2-3.at.noarch.rpm
kernel-2.4.22-1.2197.nptl.i686.rpm
kernel-doc-2.4.22-1.2197.nptl.i386.rpm
kernel-module-hostap-2.4.22-1.2197.nptl-0.1.3-4.rhfc1.at.i686.rpm
kernel-module-ipw2100-2.4.22-1.2197.nptl-0.51-14.rhfc1.at.i686.rpm
kernel-source-2.4.22-1.2197.nptl.i386.rpm
rpm -U all of these together and reboot, I aliases eth1 to ipw21001
iwconfig eth1
Warning: Driver for device eth1 recommend version 16 of Wireless Extension,
but has been compiled with version 15, therefore some driver features
may not be available...
eth1 IEEE 802.11b ESSID:"Airport" Nickname:"localhost.localdomain"
Mode:Managed Channel:10 Access Point: 00:02:2D:88:39:B2
Bit Rate=11Mb/s Tx-Power=32 dBm
Retry

n RTS thr=2304 B Fragment thr

ff
Power Management

ff
Link Quality:95/100 Signal level:-63 dBm Noise level:-98 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:04:23:76:50:BB
inet addr:10.1.1.204 Bcast:10.1.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2339 errors:0 dropped:0 overruns:0 frame:0
TX packets:1892 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:571046 (557.6 Kb) TX bytes:188171 (183.7 Kb)
Interrupt:9 Base address:0xf000 Memory:d0201000-d0201fff
Have fun,
Bas Meijer