Firmware bug? No effect on changing channels using iwconfig

Kishore Ramachandran ramack
Wed Jun 22 07:17:12 PDT 2005


I wrote about this sometime back as well. I am trying to use the "manual
scan and roam" option (iwpriv wlan0 host_roaming 2). Unfortunately, I am
unable to change channels using iwconfig. There are no errors reported in
dmesg or /var/log/messages. Is this a firmware bug?

As indicated below, I am using hostap driver version 0.3.7, linux kernel
v2.4.30 and firmware v1.4.9.

The sequence of steps I take are:
(a) iwconfig wlan0 mode managed essid 4G
(b) iwpriv wlan0 host_roaming 2
(c) iwconfig wlan0 channel 11 (no change indicated by iwconfig display)
(d) iwconfig wlan0 ap 00:09:5B:91:59:58 (association not successful)

Using ethereal, I noted that the first set of authentication and
association frames go out on the channel on which the card found an AP
after step (a). Beyond this point, all authentication and association
frames go out on channel 1. Changing channels has no effect and there are
no errors in dmesg or /var/log/messages.

Please let me know what's going on.


dmesg output:
hostap_crypt: registered algorithm 'NULL'
hostap_cs: 0.3.7 - 2005-02-12 (Jouni Malinen <jkmaline at>)
hostap_cs: setting Vcc=33 (constant)
hostap_cs: setting Vcc=50 (from config)
Checking CFTABLE_ENTRY 0x01 (default 0x01)
IO window settings: cfg->io.nwin=1
io->flags = 0x0046, io.base=0x0000, len=64
hostap_cs: Registered netdevice wifi0
hostap_cs: index 0x01: Vcc 5.0, irq 3, io 0x0100-0x013f
prism2_hw_init: initialized in 200 ms
wifi0: NIC: id=0x800c v1.0.0
wifi0: PRI: id=0x15 v1.1.0
wifi0: STA: id=0x1f v1.4.9
wifi0: defaulting to bogus WDS frame as a workaround for firmware bug in
Host AP mode WDS
wifi0: registered netdevice wlan0
wlan0: Host AP mode does not support 'Any' essid
ip_tables: (C) 2000-2002 Netfilter core team
prism2: wlan0: operating mode changed 3 -> 2
wifi0: LinkStatus=2 (Disconnected)
wifi0: LinkStatus: BSSID=00:0d:3a:23:15:3d
wifi0: LinkStatus=1 (Connected)
wifi0: LinkStatus: BSSID=00:09:5b:91:59:a1

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