Hello,
since i upgraded my Raspberry Pi 400 (with regular Debian 10, not
Raspberry PI OS) to the latest buster version, i am experiencing
problems with dns, which i cannot replicate with any of my other devices
(Debian Stretch amd64 workstation, Debian Buster amd64 server, Raspberry
Pi 3b armhf raspberrypi OS). But i can replicate this behavior with
another another micro sd flashcard with Twister OS on the (same)
Raspberry Pi 400. Twister OS is an Debian / Raspberry Pi OS based OS
which helps you to game on the Raspberry Pi 400.
I noticed the problem, while i was browsing the internet and got
confused because after a while some domains could not longer be
found/connected to by the browser. (On both, Firefox and Chromium)
-- Firefox
Hmm. We’re having trouble finding that site.
We can’t connect to the server at github.com.
If that address is correct, here are three other things you can try:
Try again later.
Check your network connection.
If you are connected but behind a firewall, check that Firefox has
permission to access the Web.
--
-- Chromium
This site can’t be reachedCheck if there is a typo in github.com.
DNS_PROBE_FINISHED_NXDOMAIN
--
And as time passes, more and more website will disappear.
Which means, that after a hour only barely visited domains are left.
And even stranger is the output of different dns tools:
-- host github.com
moke@rpi4-20201112:~$ host github.com
Host github.com not found: 2(SERVFAIL)
--
-- dig github.com
; <<>> DiG 9.16.13-Debian <<>> github.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30900
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;github.com. IN A
;; ANSWER SECTION:
github.com. 27 IN A 140.82.121.3
;; Query time: 343 msec
;; SERVER: 10.0.0.1#53(10.0.0.1)
;; WHEN: Tue Mar 30 23:31:01 CEST 2021
;; MSG SIZE rcvd: 55
--
Dig seems to be able to get the ip from github.com but (the program)
host, firefox and chromium can't.
Some system information
--
moke@rpi4-20201112
------------------
OS: Debian GNU/Linux bullseye/sid aarch64
Host: Raspberry Pi 400 Rev 1.0
Kernel: 5.10.0-5-arm64
Resolution: 1440x900, 1280x1024
WM: awesome
CPU: (4) @ 1.800GHz
Memory: 606MiB / 3791MiB
--
My Raspberry Pi 400 is connected over Ethernet to my home router.
Is there someone else, who experiences / has experienced this problem?
PS: After i reboot the system all domains get unlocked (until they get
locked again).
Kind Regards
Moritz Kempe
