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There are a number of pages on the Web that describe how to set up
specific wireless cards based on the Intersil PRISM 2.5/3.0 chipsets
under Red Hat 8.0. In general, the pages fall into two categories:
- those that describe how to enable the card using the
Wavelan IEEE/Orinoco driver (commonly referred to as
orinoco_cs) that is now a standard kernel inclusion
since version 2.4.3, and
- those that describe how to set up an 11 Mbps
linux-wlan
PCMCIA driver.
However, the orinoco_cs driver shipped as part of the
2.4.18-14 kernel in Red Hat 8.0 suffers from an
"Error - 110 writing Tx descriptor to BAP"
problem. And release 3.7 of the Cisco VPN client does not appear to
work with the linux-wlan driver. (The client tries to
attach to the driver kernel module but fails.)
Use Version 0.13a (or later) of the Orinoco Driver
The problem seems to be in version 0.11b of the driver, which is
shipped as part of kernel 2.4.18-14. The problem disappears if the
more recent version of the driver - 0.13a - is used. The source code
for this can be downloaded from
David Gibson's Home
Page, who is also the author of the driver. Rebuilding the driver
requires installation of the kernel source and can be easily done by
following the instructions in the
README.orinoco
file that comes as part of the driver distribution. The driver can then
be configured by following the instructions in Section A of
Configuring the Linksys
WPC11 PCMCIA Wireless Card in Red Hat Linux 8.0 by Loran Hughes.
Configuring iptables
The Cisco VPN client relies on UDP traffic on destination port 500. If
the Linux installation is configured to run as a firewall, which may be
the case if a typical "default" installation is done, this could lead
to the "peer
not responding" problem. The easiest way of diagnosing this is to
stop iptables and retry the connection:
/home/pjoisha $ /etc/init.d/iptables stop
/home/pjoisha $ vpnclient connect nuvpn
If the connection can be successfully established, the filtering rules
need to be modified with root privileges:
/home/pjoisha $ /sbin/iptables -I INPUT -p udp
-m udp --dport 500 -j ACCEPT
/home/pjoisha $ /sbin/service iptables save
/home/pjoisha $ /sbin/service iptables restart
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