fails to connect when i change the mac address of wireless card

[Brian J. Murrell]

I have this fantasy that I can use a wired and wireless nic as mutually
exclusive replacements for each other.  i.e. when i need to roam about,
i can use wireless but when i need bandwidth, i can plug my 100Mb/s
interface into the LAN and get it -- and not lose any existing IP
sessions.

So, I thought if I have my wireless card masquerade as my wired card
when roaming is needed, by assigning it the same mac address that should
hopefully achieve my goal.  The problem seems to be that when i change
the mac address of my wireless card, it no longer seems to work with my
AP using WPA and wpa_supplicant.

Here is the log of wpa_supplicant (with 1 -d) of it trying to do it's
thing:

Configuration file '/etc/wpa_supplicant.conf' -> '/etc/wpa_supplicant.conf'
Reading configuration file '/etc/wpa_supplicant.conf'
ctrl_interface='/var/run/wpa_supplicant'
eapol_version=1
EAPOL: SUPP_PAE entering state DISCONNECTED
EAPOL: KEY_RX entering state NO_KEY_RECEIVE
EAPOL: SUPP_BE entering state INITIALIZE
EAP: EAP entering state DISABLED
EAPOL: External notification - portEnabled=0
EAPOL: External notification - portValid=0
wpa_driver_hostap_set_wpa: enabled=1
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_countermeasures: enabled=0
wpa_driver_hostap_set_drop_unencrypted: enabled=1
Setting scan request: 0 sec 100000 usec
Wireless event: cmd=0x8b15 len=20
Wireless event: new AP: 00:00:00:00:00:00
Disconnect event - remove keys
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
EAPOL: External notification - portEnabled=0
EAPOL: External notification - portValid=0
Wireless event: cmd=0x8b15 len=20
Wireless event: new AP: 00:00:00:00:00:00
Disconnect event - remove keys
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
EAPOL: External notification - portEnabled=0
EAPOL: External notification - portValid=0
Starting AP scan (broadcast SSID)
Wireless event: cmd=0x8b19 len=12
Received 228 bytes of scan results (1 BSSes)
Scan results: 1
0: 00:04:e2:b2:c9:52 ssid='ilinx' wpa_ie_len=24 rsn_ie_len=0
Trying to associate with 00:04:e2:b2:c9:52 (SSID='ilinx' freq=2437 MHz)
Cancelling scan request
WPA: using IEEE 802.11i/D3.0
WPA: Own WPA IE - hexdump(len=24): dd 16 00 50 f2 01 01 00 00 50 f2 02 01 00 00
50 f2 02 01 00 00 50 f2 02
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_drop_unencrypted: enabled=1
wpa_driver_hostap_associate
Setting authentication timeout: 5 sec 0 usec
EAPOL: External notification - EAP success=0
EAPOL: External notification - EAP fail=0
EAPOL: External notification - portControl=Auto
Wireless event: cmd=0x8b15 len=20
Wireless event: new AP: 00:00:00:00:00:00
Disconnect event - remove keys
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
EAPOL: External notification - portEnabled=0
EAPOL: External notification - portValid=0
EAPOL: External notification - EAP success=0
Wireless event: cmd=0x8b04 len=12
Wireless event: cmd=0x8b15 len=20
Wireless event: new AP: 00:00:00:00:00:00
Disconnect event - remove keys
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
EAPOL: External notification - portEnabled=0
EAPOL: External notification - portValid=0
EAPOL: External notification - EAP success=0
Wireless event: cmd=0x8b1a len=17
Wireless event: cmd=0x8b15 len=20
Wireless event: new AP: 00:04:e2:b2:c9:52
Association event - clear replay counter
Associated to a new BSS: BSSID=00:04:e2:b2:c9:52
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_hostap_set_key: alg=none key_idx=0 set_tx=0 seq_len=0 key_len=0
EAPOL: External notification - portValid=0
EAPOL: External notification - EAP success=0
EAPOL: External notification - portEnabled=1
EAPOL: SUPP_PAE entering state CONNECTING
EAPOL: txStart
WPA: drop TX EAPOL in non-IEEE 802.1X mode (type=1 len=0)
EAPOL: SUPP_BE entering state IDLE
EAP: EAP entering state INITIALIZE
EAP: EAP entering state IDLE

and it basically just repeats itself.

So I did try doing it the other way around and have the wired interface
masquerade the wireless interface and that seems to fix the above
problem.  In fact I think it would all work except that the DHCP server
seems to be figuring out that I am playing tricks, despite the mac
addresses being the same and the client identifier being the same.  But
that's for another list.  :-)

Any ideas on what is going on above, just for interest's sake?

b.

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