Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.debian.user > #203333
| From | Vincent Lefevre <vincent@vinc17.net> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: wifi with no encryption: No DHCPOFFERS received |
| Date | 2018-12-13 14:20 +0100 |
| Message-ID | <x4z4e-2Ub-5@gated-at.bofh.it> (permalink) |
| References | <x3W2R-3ON-3@gated-at.bofh.it> <x3X8B-4uN-7@gated-at.bofh.it> <x4dZL-6xj-3@gated-at.bofh.it> <x4eM9-740-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 2018-12-12 10:30:44 -0500, Dan Ritter wrote:
> Yeah, I think you had a link problem, not a DHCP problem.
I've tried today, and the issue is not always reproducible.
But since there are several access points with the same ESSID,
a reason might be that wicd doesn't always try to connect to
the same one, and one of them at least may yield the error.
This could explain why the connection succeeded with Android.
After stopping the wicd daemon (service wicd stop):
root@zira:/home/vinc17# iw dev wlp61s0 link
Not connected.
root@zira:/home/vinc17# iw dev wlp61s0 scan
command failed: Network is down (-100)
root@zira:/home/vinc17# ifconfig wlp61s0 up
root@zira:/home/vinc17# iw dev wlp61s0 link
Not connected.
root@zira:/home/vinc17# iw dev wlp61s0 scan
[a lot of output]
Something interesting is that not all corresponding to "invites"
are equivalent, e.g.
BSS 00:26:cb:11:1a:82(on wlp61s0)
last seen: 63544.369s [boottime]
TSF: 33102324019 usec (0d, 09:11:42)
freq: 2462
beacon interval: 100 TUs
capability: ESS ShortPreamble ShortSlotTime (0x0421)
signal: -73.00 dBm
last seen: 3060 ms ago
Information elements from Probe Response frame:
SSID: invites
Supported rates: 11.0* 12.0 18.0 24.0 36.0 48.0
DS Parameter set: channel 11
ERP: <no flags>
WMM: * Parameter version 1
* u-APSD
* BE: CW 15-1023, AIFSN 3
* BK: CW 15-1023, AIFSN 7
* VI: CW 7-15, AIFSN 2, TXOP 6016 usec
* VO: CW 3-7, AIFSN 2, TXOP 3264 usec
BSS 44:ad:d9:bb:d2:42(on wlp61s0)
last seen: 63544.360s [boottime]
TSF: 33118289997 usec (0d, 09:11:58)
freq: 2462
beacon interval: 102 TUs
capability: ESS ShortPreamble ShortSlotTime (0x0421)
signal: -81.00 dBm
last seen: 3068 ms ago
SSID: invites
Supported rates: 11.0* 12.0 18.0 24.0 36.0 48.0
DS Parameter set: channel 11
ERP: <no flags>
HT capabilities:
Capabilities: 0x186e
HT20/HT40
SM Power Save disabled
RX HT20 SGI
RX HT40 SGI
No RX STBC
Max AMSDU length: 7935 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 8 usec (0x06)
HT RX MCS rate indexes supported: 0-15
HT TX MCS rate indexes are undefined
HT operation:
* primary channel: 11
* secondary channel offset: no secondary
* STA channel width: 20 MHz
* RIFS: 0
* HT protection: non-HT mixed
* non-GF present: 1
* OBSS non-GF present: 0
* dual beacon: 0
* dual CTS protection: 0
* STBC beacon: 0
* L-SIG TXOP Prot: 0
* PCO active: 0
* PCO phase: 0
WMM: * Parameter version 1
* u-APSD
* BE: CW 15-1023, AIFSN 3
* BK: CW 15-1023, AIFSN 7
* VI: CW 7-15, AIFSN 2, TXOP 3008 usec
* VO: CW 3-7, AIFSN 2, TXOP 1504 usec
root@zira:/home/vinc17# iw dev wlp61s0 connect invites
root@zira:/home/vinc17# iw dev wlp61s0 link
Connected to 00:26:cb:b8:bf:f2 (on wlp61s0)
SSID: invites
freq: 2412
RX: 22122 bytes (117 packets)
TX: 4371 bytes (20 packets)
signal: -76 dBm
tx bitrate: 24.0 MBit/s
bss flags: short-preamble short-slot-time
dtim period: 2
beacon int: 100
root@zira:/home/vinc17# dhclient wlp61s0
ping: Warning: source address might be selected on device other than wlp61s0.
and I get an IP address. This always works, and I can see I get
the link immediately or almost immediately.
However, if I do like what wicd does according to its logs, i.e.
[...]
2018/12/11 18:44:15 :: ifconfig wlp61s0 up
2018/12/11 18:44:17 :: enctype is None
2018/12/11 18:44:17 :: ['iwconfig', 'wlp61s0', 'essid', '--', 'invites']
2018/12/11 18:44:17 :: iwconfig wlp61s0 channel 11
2018/12/11 18:44:17 :: iwconfig wlp61s0 ap 00:26:CB:11:1A:82
2018/12/11 18:44:17 :: Running DHCP with NO hostname
2018/12/11 18:44:17 :: /sbin/dhclient -v -cf /var/lib/wicd/dhclient.conf wlp61s0
[...]
this does not work:
root@zira:/home/vinc17# iwconfig wlp61s0 essid -- invites
root@zira:/home/vinc17# iw dev wlp61s0 link
Not connected.
root@zira:/home/vinc17# iwconfig wlp61s0 channel 11
root@zira:/home/vinc17# iwconfig wlp61s0 ap 00:26:CB:11:1A:82
root@zira:/home/vinc17# iw dev wlp61s0 link
Not connected.
(and still no link after several minutes). Note that the BSS is
different, but that's wicd's fault to choose a wrong one, while
iw is always successful.
I've reported the following bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916348
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
Back to linux.debian.user | Previous | Next — Previous in thread | Find similar | Unroll thread
wifi with no encryption: No DHCPOFFERS received Vincent Lefevre <vincent@vinc17.net> - 2018-12-11 20:40 +0100
Re: wifi with no encryption: No DHCPOFFERS received Dan Ritter <dsr@randomstring.org> - 2018-12-11 21:50 +0100
Re: wifi with no encryption: No DHCPOFFERS received Vincent Lefevre <vincent@vinc17.net> - 2018-12-12 15:50 +0100
Re: wifi with no encryption: No DHCPOFFERS received Dan Ritter <dsr@randomstring.org> - 2018-12-12 16:40 +0100
Re: wifi with no encryption: No DHCPOFFERS received Vincent Lefevre <vincent@vinc17.net> - 2018-12-13 14:20 +0100
csiph-web