I am using openwrt on the following system:
root@OpenWrt:/tmp# iw --version
iw version 3.17
ieee80211 phy0: Atheros AR9340 Rev:2 mem=0xb8100000, irq=47
I want to switch between managed (station) mode and monitor mode.
So I have the follwoing scenarion:
root@OpenWrt:/tmp# iw dev
phy#1
Interface wlan1
ifindex 5
wdev 0x100000001
addr 00:90:a9:ab:f8:ed
type managed
phy#0
Interface wlan0
ifindex 21 #steadily increasing, not re-used ?
wdev 0x10
addr 00:90:a9:ab:f8:eb
type managed
root@OpenWrt:/tmp# ifconfig wlan0 up
root@OpenWrt:/tmp# iw dev wlan0 connect SSID
root@OpenWrt:/tmp# udhcpc -i wlan0 --quit
udhcpc (v1.23.2) started
Sending discover...
Sending select for 192.168.20.144...
Lease of 192.168.20.144 obtained, lease time 28800
udhcpc: ifconfig wlan0 192.168.20.144 netmask 255.255.255.0 broadcast 192.168.20.255
udhcpc: setting default routers: 192.168.20.1
root@OpenWrt:/tmp# wget http://somewhere.com/something.html
Connecting to somewhere.com (xx.xx.xx.xx:80)
wget: server returned error: HTTP/1.1 500 Internal Server Error
root@OpenWrt:/tmp# iw phy phy0 interface add wmon0 type monitor
root@OpenWrt:/tmp# iw dev
phy#1
Interface wlan1
ifindex 5
wdev 0x100000001
addr 00:90:a9:ab:f8:ed
type managed
phy#0
Interface wmon0
ifindex 22
wdev 0x11
addr 00:90:a9:ab:f8:eb
type monitor
Interface wlan0
ifindex 21
wdev 0x10
addr 00:90:a9:ab:f8:eb
ssid SSID
type managed
channel 7 (2442 MHz), width: 40 MHz, center1: 2452 MHz
root@OpenWrt:/tmp# ifconfig wmon0 up
root@OpenWrt:/tmp# iw dev
phy#1
Interface wlan1
ifindex 5
wdev 0x100000001
addr 00:90:a9:ab:f8:ed
type managed
phy#0
Interface wmon0
ifindex 22
wdev 0x11
addr 00:90:a9:ab:f8:eb
type monitor
Interface wlan0
ifindex 21
wdev 0x10
addr 00:90:a9:ab:f8:eb
ssid SSID
type managed
channel 7 (2442 MHz), width: 40 MHz, center1: 2452 MHz
root@OpenWrt:/tmp# iw dev wlan0 del
root@OpenWrt:/tmp# iw dev
phy#1
Interface wlan1
ifindex 5
wdev 0x100000001
addr 00:90:a9:ab:f8:ed
type managed
phy#0
Interface wmon0
ifindex 22
wdev 0x11
addr 00:90:a9:ab:f8:eb
type monitor
channel 7 (2442 MHz), width: 20 MHz (no HT), center1: 2442 MHz
root@OpenWrt:/tmp# iw dev wmon0 set channel 1
root@OpenWrt:/tmp# iw dev
phy#1
Interface wlan1
ifindex 5
wdev 0x100000001
addr 00:90:a9:ab:f8:ed
type managed
phy#0
Interface wmon0
ifindex 22
wdev 0x11
addr 00:90:a9:ab:f8:eb
type monitor
channel 7 (2442 MHz), width: 20 MHz (no HT), center1: 2442 MHz
As to be seen, the modification of the channel does not generate an error, but is simply ignored.
What did I do wrong ?
Second question: The "ifindex" is always increasing, during several tests,
when unsuccessfully trying similar scenarios (different sequence of ifconfig ... up/down, iw dev ... del etc.)
Will this "ifindex" "overflow" some time,
even in case of repeated "iw phy phy0 interface add wmon0 type monitor" "iw dev wmon0 del" ?
I would have expected some kind of "reuse".
Regards
--
Reiner Karlsberg
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4842 / Virus Database: 4447/10982 - Release Date: 11/11/15
Internal Virus Database is out of date.
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