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Re: Weird WiFi problem

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On 5/23/21 4:55 PM, Juan R. de Silva wrote:
> Help needed from somebody with the better networking knowledge than mine.
> 
> Debian Buster on Dell M4800 Mobile Workstation, Intel Corporation
> Wireless 7260 (rev bb) WiFi adapter. The ISP modem offers 2 WiFi bands:
> 2.4G & 5G. The system connects automatically to 5G. 2.4G is reserved for
> my printer use. Email client - Evolution 3.30.5-1.1.
> 
> Starting of May 1, after system upgrade (dnsutils, bind9-host, and a
> bunch of related libs) I started having problems accessing GMail and
> Hotmail servers. Evolution ultimately connects and retrieves my mail but
> it take it from 20 up to 50 minutes. However, if I switch manually to
> 2.4G band or if I wire the laptop to the modem, Evolution connects on fly
> with no time. Reinstalling suspected upgrade did not help.
> 
> My ISP replaced the modem with one with a newer firmware - no results
> 
> I finally noticed that when on 5G band my IPv6 address cannot be detected
> by any of "what is my IP websites". Only IPv4 is visible to the outside
> world. But when I switch to 2.4 band (or wire the laptop to the modem) my
> IPv6 address is correctly detected along with the IPv4 one.
> 
> CLI utilities confirm that my IPv6 is enabled and that WiFi interface is
> assigned an IPv6 address. One for 2.4G band & a different one for 5G
> band. I'm pushing my ISP to investigate their part of the network. But
> what bothers me is that I'm not sure in it. What if either Intel adapter
> or its Linux driver is in fault. And I have no means to test that...
> 
> Any suggestions folks?..


Where is your Internet connection -- e.g. what country?


Who is your ISP?  Please provide a URL.


What Internet service plan do you have?  Please provide a URL with the 
plan details.


What is the make and model of your "modem"?  Please provide a URL for 
the support page.


Is the "modem" provided by your ISP acting as a bridge or a router? 
Where is the DHCP server -- at your ISP or the "modem"?  Where is the 
DNS proxy -- at your ISP or the "modem"?  Do your local devices have 
public IP addresses or private LAN addresses?


David

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Thread

Weird WiFi problem "Juan R. de Silva" <juan.r.d.silva@gmail.com> - 2021-05-24 02:00 +0200
  Re: Weird WiFi problem David Christensen <dpchrist@holgerdanske.com> - 2021-05-24 07:10 +0200
    Re: Weird WiFi problem "Juan R. de Silva" <juan.r.d.silva@gmail.com> - 2021-05-24 17:50 +0200
      Re: Weird WiFi problem Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-05-24 18:30 +0200
        Re: Weird WiFi problem Henning Follmann <hfollmann@itcfollmann.com> - 2021-05-24 19:30 +0200
          Re: Weird WiFi problem Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-05-25 04:00 +0200
            Re: Weird WiFi problem Henning Follmann <hfollmann@itcfollmann.com> - 2021-05-25 13:50 +0200
      Re: Weird WiFi problem Charles Curley <charlescurley@charlescurley.com> - 2021-05-24 19:40 +0200
        Re: Weird WiFi problem Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-05-25 03:50 +0200
          Re: Weird WiFi problem deloptes <deloptes@gmail.com> - 2021-05-25 10:30 +0200

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