WEP fails with Unsupported authentication algorithm (7820)

[Sergey Matyukevich]

Hi Egor,

> > > During the transition from wpa_supplicant v2.4 to v2.9 on a legacy
> > > project I get the following message:
> > >
> > > mgmt::auth
> > > authentication: STA=7c:dd:90:44:a5:83 auth_alg=7820
> > > auth_transaction=112 status_code=31962 wep=1 seq_ctrl=0x60a0
> > > Unsupported authentication algorithm (7820)
> > > authentication reply: STA=7c:dd:90:44:a5:83 auth_alg=7820
> > > auth_transaction=113 resp=13 (IE len=0) (dbg=handle-auth)
> > >
> > > My conf file looks like this:
> > >
> > > ctrl_interface=/var/run/wpa_supplicant
> > > ap_scan=1
> > >
> > > network={
> > >         ssid="myssid"
> > >         mode=2
> > >         frequency=2447
> > >         key_mgmt=NONE
> > >         wep_key0="passw"
> > >         wep_tx_keyidx=0
> > > }
> > >

...

> The old working rootfs had wpa_supplicant 2.4 but I have also tested
> it with the same kernel version 5.4.8. wpa_supplicant 2.10 has no
> problem with WPA/WPA2 and no encryption. The only problem so far is
> WEP.

Coud you please clarify which combination of kernel/wpa_ did work on
your setup ? Did your WEP setup worked with new kernel and old wpa_s ?

I could not reproduce similar behavior using hwsim and AP and STA both
operated by wpa_s. What kind of client are you using ? Is it possible
to configure auth_alg on your client ?

If you can configure auth_alg on both AP and STA, then could you please
try explicitly specify the same auth_alg on both sides. For this purpose
you may set auth_alg=OPEN or auth_alg=SHARED in wpa_supplicant configs
for both AP and STA network configurations. If client configuration is
beyond your control, then could you please try explictly both auth_alg
options on AP side.

Regargs,
Sergey