On 2021-05-24 11:47 a.m., Juan R. de Silva wrote: > On Sun, 23 May 2021 21:53:45 -0700, David Christensen wrote: > >> 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 > > I finally narrowed the problem to one specific source by installing > Windows 10 and KDE Neon in parallel to my Debian. After booting into > either of them and using 5G WiFi band my IPv6 address is visible from the > outside world as expected. Thus now I know that both my adapter and its
> Linux driver are fine, which clearly marks my Debian 10 being corrupted > in some way. > > Right now I'm inclined to resolve this odd problem by reinstalling > Debian. It looks to be an easier path comparing to finding a weird GNOME > bug without even having a minimal clue of what part might be responsible > for it. > > If this problem shows up once again this will make an end of GNOME for > me. Using GNOME for many years I've been reluctant to change DE. May be > it's the time now. :-( What a crazy thing here... Now desktop environment cause network problem ! Ever tried using your network card from the CLI without loading Gnome and doing a real test, also using Gnome without using the Network Manager but other way of managing your network connection (as it's not a obligation to use the NetworkManager). > > Sorry, I'm answering neither of your (in other circumstances rightful) > questions, since IMHO my findings made them irrelevant to the case. > > Thanks > -- Polyna-Maude R.-Summerside -Be smart, Be wise, Support opensource development
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