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Using ath9k on RHEL5
RHEL 5.5 get a wireless facelift. The facelift consists of getting a new mac80211, cfg80211 and some wireless drivers backported from 2.6.32 down to 2.6.18. Along with it came ath9k. This section documents how to get the kernels to get ath9k on your Centos5/RHEL5 kernels and tries to track any issues present on them.
Go grab the kernels here:
If you do not have RHEL 5.4 you can try Centos 5.4.
RHEL 5.4 and 5.5 only support wireless extensions as such only the old functionality that you are used to with 802.11 will be available. This is enough to get you using IBSS, and Station mode of operation. AP mode of operation is not supported, neither is Mesh.
Regulatory wise since this backport did not include nl80211 support it does mean static regulatory domains are used only. For Atheros cards on this kernel (ath5k, ath9k) this means the static Atheros world regulatory domain will be used. Since AP and Mesh is not supported on this release the only known implication this will have on Atheros drivers should be not being able to initialize beaconing on some 5 GHz channels for IBSS. For details on what this implies refer to the ath initialization page.
Supported modes of operation
Mesh is not enabled on the build and AP requires nl80211 and since nl80211 is not supported on this kernel you will not be able to use AP mode of operation.
bug 543719 - AR9285 associates but requires tcpdump to get DHCP replies.
workaround for bug 543719 allows AR9285 get DHCP replies. Tested on RHEL 5.4 and 5.5 clones (Scientific Linux).
Enabling Network Manager
Upon logging into the GNOME desktop Network Manager is already stared but the applet does not come up. To do that, as root do:
service NetworkManager start
To make it automatically enabled do:
chkconfig NetworkManager on
It should be noted that running this will prevent you from using wpa_supplicant or the root console to configure and manage the wireless device manually.