Re: DNS problems on Raspberry Pi 400 (Debian 10.9)
On 3/31/21 3:22 PM, Nicholas Geovanis wrote:
On Wed, Mar 31, 2021, 8:08 AM Moritz Kempe <deblist+debian@moke12g.de
<mailto:deblist%2Bdebian@moke12g.de>> wrote:
On 3/31/21 1:55 PM, Lee wrote:
> On 3/31/21, Moritz Kempe <deblist+debian@moke12g.de
<mailto:deblist%2Bdebian@moke12g.de>> wrote:
>> On 3/31/21 1:25 PM, Greg Wooledge wrote:
>>> On Wed, Mar 31, 2021 at 12:14:59AM +0200, Moritz Kempe wrote:
>>>> -- Firefox Hmm. We’re having trouble finding that site. We can’t
>>>> connect to the server at github.com <http://github.com>.
>>>> -- Chromium This site can’t be reachedCheck if there is a typo in
>>>> github.com <http://github.com>. DNS_PROBE_FINISHED_NXDOMAIN
>>>> moke@rpi4-20201112:~$ host github.com <http://github.com>
Host github.com <http://github.com> not found:
>>>> 2(SERVFAIL)
>>> grep ^hosts: /etc/nsswitch.conf
>> --
>> hosts: files mdns4_minimal [NOTFOUND=return] dns
mymachines
> I don't trust multicast dns, so in addition to turning it off
I've also got
> $ grep host /etc/nsswitch.conf
> # hosts: files mdns4_minimal [NOTFOUND=return] dns
> hosts: files dns
>
> Maybe worth a shot?
Changed my /etc/nsswitch.conf to
--
..
#hosts: files mdns4_minimal [NOTFOUND=return] dns mymachines
hosts: files dns
..
--
and rebooted the system. The behavior hasn't changed.
github.com <http://github.com> is still blocked. And dig is still
able to find the ip address.
Or do i have done something wrong?
I have found out, that i can restore some domains when running
"/sbin/dhclient" as root but not all. Github is still not accessible.
That's why I suggested checking for DHCP messages in the logs. But
also logs upstream from your pi's. Each time you get a DHCP grant,
potentially you've switched DNS servers.
Do you mean the logs at /var/log/syslog?
And for what i look out for?
Here are some entries, maybe you see something important for this issue.
--
Mar 31 14:39:04 rpi4-20201112 dhclient[5538]: DHCPDISCOVER on docker0 to
255.255.255.255 port 67 interval 7
Mar 31 14:39:11 rpi4-20201112 dhclient[5538]: DHCPDISCOVER on docker0 to
255.255.255.255 port 67 interval 20
Mar 31 14:39:31 rpi4-20201112 dhclient[5538]: DHCPDISCOVER on docker0 to
255.255.255.255 port 67 interval 12
Mar 31 14:39:43 rpi4-20201112 dhclient[5538]: DHCPDISCOVER on docker0 to
255.255.255.255 port 67 interval 19
Mar 31 14:40:02 rpi4-20201112 dhclient[5538]: DHCPDISCOVER on docker0 to
255.255.255.255 port 67 interval 3
Mar 31 14:40:05 rpi4-20201112 dhclient[5538]: No DHCPOFFERS received.
Mar 31 14:40:05 rpi4-20201112 dhclient[5538]: No working leases in
persistent database - sleeping.
-- This was logged for many times.
--
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: Internet Systems Consortium
DHCP Client 4.4.1
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: Copyright 2004-2018
Internet Systems Consortium.
Mar 31 15:05:49 rpi4-20201112 ifup[478]: For info, please visit
https://www.isc.org/software/dhcp/
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: All rights reserved.
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: For info, please visit
https://www.isc.org/software/dhcp/
Mar 31 15:05:49 rpi4-20201112 dhclient[478]:
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: Listening on
LPF/eth0/##:##:##:##:##:## # censored by me
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: Sending on
LPF/eth0/##:##:##:##:##:## # censored by me
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: Sending on Socket/fallback
Mar 31 15:05:49 rpi4-20201112 dhclient[478]: DHCPDISCOVER on eth0 to
255.255.255.255 port 67 interval 8
Mar 31 15:05:50 rpi4-20201112 NetworkManager[417]: <info>
[1617195950.2281] dhcp-init: Using DHCP client 'internal'
Mar 31 15:05:57 rpi4-20201112 dhclient[478]: DHCPDISCOVER on eth0 to
255.255.255.255 port 67 interval 14
Mar 31 15:05:58 rpi4-20201112 dhclient[478]: DHCPOFFER of 10.0.0.70 from
10.0.0.1
Mar 31 15:05:58 rpi4-20201112 dhclient[478]: DHCPREQUEST for 10.0.0.70
on eth0 to 255.255.255.255 port 67
Mar 31 15:05:58 rpi4-20201112 dhclient[478]: DHCPACK of 10.0.0.70 from
10.0.0.1
Mar 31 15:06:38 rpi4-20201112 dhclient[478]: bound to 10.0.0.70 --
renewal in 3831703 seconds.
--
I used the command "cat /var/log/syslog | grep dhc"
And you said
But also logs upstream from your pi's.
do you mean the DHCP log from my router? Because i searched for one, but
i haven't found one yet.
Or do you mean that i should use Wireshark to analyze my DHCP requests?
I haven't looked into networking on that level.
I would be nice, if you would give me an explanation or link a website
which could do that.
Note: I haven't changed any networking configuration on this
device. I
haven't even enabled wifi.
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