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:
Never saw that before said the man on fire :-) So just guesses:
Some weird DNS TTL issue? Or TTL incompatibility?
Strange DNS local caching issue? Maybe check resolv.conf and name service config for new options or something.
Do you see any unexpected DHCP messages in the logs, maybe further upstream from the pi's?
-- 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