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Re: wifi with no encryption: No DHCPOFFERS received

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On 2018-12-11 15:45:19 -0500, Dan Ritter wrote:
> Check the link status:
> 
> iw dev wlp61s0 link
> 
> Look for the hotspot:
> 
> iw dev wlp61s0 scan
> 
> Connect to one:
> 
> iw dev wlp61s0 connect "$ESSID"
> 
> Run dhclient by hand:
> 
> dhclient wlp61s0
> 
> Tell us where it falls down along that path.

Thanks for the instructions. I hope I can try tomorrow
(I need to bring my laptop there).

In the mean time, I could try another open wifi hotspot that was
reachable, and the connection was successful. I could see a difference
in the kernel logs. This time, I had the following additional lines:

Dec 12 10:36:50 zira kernel: wlp61s0: authenticate with 14:0c:76:9f:e9:d9
Dec 12 10:36:50 zira kernel: wlp61s0: send auth to 14:0c:76:9f:e9:d9 (try 1/3)
Dec 12 10:36:50 zira kernel: wlp61s0: aborting authentication with 14:0c:76:9f:e9:d9 by local choice (Reason: 3=DEAUTH_LEAVING)
Dec 12 10:36:50 zira kernel: wlp61s0: authenticate with 14:0c:76:9f:e9:d9
Dec 12 10:36:50 zira kernel: wlp61s0: send auth to 14:0c:76:9f:e9:d9 (try 1/3)
Dec 12 10:36:50 zira kernel: wlp61s0: authenticated
Dec 12 10:36:50 zira kernel: wlp61s0: associate with 14:0c:76:9f:e9:d9 (try 1/3)
Dec 12 10:36:50 zira kernel: wlp61s0: RX AssocResp from 14:0c:76:9f:e9:d9 (capab=0x401 status=0 aid=1)
Dec 12 10:36:50 zira kernel: wlp61s0: associated
Dec 12 10:36:50 zira kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlp61s0: link becomes ready

So, the issue was not due to DHCP.

BTW, I don't know whether this is related, but I sometimes
see a kernel warning with a trace, e.g.

Dec 11 11:01:43 zira kernel: ------------[ cut here ]------------
Dec 11 11:01:43 zira kernel: TX on unused queue 2
Dec 11 11:01:43 zira kernel: WARNING: CPU: 0 PID: 2545 at /build/linux-F3l5KA/linux-4.18.20/drivers/net/wireless/intel/iwlwifi/pcie/tx.c:2287 iwl_trans_pcie_tx+0xdab/0x1180 [iwlwifi]
[...]

-- 
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)

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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

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